4 steps to make (almost) any blowback 9mm AR run 100% (AR9/AR-9 simple blowback)
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- čas přidán 9. 07. 2024
- NOT for CMMG Banshee! After a great deal of research, study and testing, I discovered (and confirmed many times over) that there are 4 simple key steps that should get almost any 9mm AR feeding, cycling, running, and ejecting properly. Note when I say "100%", I mean it should feed, fire, and function as reliably as would be expected from a typical quality firearm. No mechanical system runs 100% perfectly 100% of the time.
More information including links can be found at Blowback9.com.
I wear ear plugs, or muffs, or both, in every shooting video.
Disclaimer:
Blowback9's videos are filmed at a private shooting club in a controlled setting under the supervision of trained professionals. Blowback9's videos are for entertainment purposes only. Do not try to recreate or mimic anything seen in Blowback9's videos. Do not act in any way based upon any of the information found in Blowback9's videos. The accuracy of the information in Blowback9's videos is not guaranteed or warranted in any way. You, and only you, are responsible for the consequences of your actions. By watching Blowback9's videos you agree that we will not be held liable for any injury to yourself, others, or property resulting from attempting anything based on what is shown or described in these videos.
I have been a frustrated owner of a 9mm AR for years! It took a lot of time and research to get my 9mm AR running reliably. I am glad to see that you are putting all the important information in one place for future 9mm AR owners to find easily. I wish your page existed ten years ago.
I was LITERALLY about to ask if you were the guy who runs that awesome site full of great info and you answered it on your first sentence. Subscribed.
That's me! Thanks!
Damn. I’ve been chasing my ejection issues the past two range sessions. My ejector was a point and at the bottom of the bolt. Squared it off, moved up and in and never ejected better. Thank you sir.
5 star videos
very good video. thanks for including picture of ejector alignment.
Glad you liked it!
I really appreciate all of your research! I was able to build my 9mm AR upper with 100% function and reliability first try with your info and reply's. Here is my build for anyone wondering: BKings Bolt Carrier Group, BKings Carbine Buffer Spring, Kaw Valley Precision 10oz 9mm Tungsten Buffer, Ballistic Advantage 16" 9mm Barrel, Spike's Stripped 9mm upper receiver, Spike's Tactical Battle Trigger, and MeanArms Magpul Pmag 9mm conversion. Recoil feels better than my sig 516 upper.
I was having ejector issues with my AR-9, it was low but I recently adjusted it to how you showed. Haven’t got to test it out yet. Great video and information
This is the way. My Aero EPC9 is now running like a scalded ape without a single issue since ditching the (Aero BCG) for a proper one with the feed lug and 5.56 extractor.
My 1st AR 9 buiran flawlessly accept, as you stated. JHP tried modifying the feed cone and also tried installing a feed ramp it was a nogo. Installed a Taccom supper feed barrel problem solved . Great company great customer service
Very clear and concise information. This is the best short video on this topic I have been able to find. Thanks!
Thanks for what you are doing!
I rarely comment on youtube content but this is great info and well presented. I’ve learned so much from this video alone.
Thank you for what you do.
Great video! Wish your video was around when I built my AR9s. I had to learn all this on my own. Good job!
Thank you for the info!
Great video, I actually read your articles online before seeing this video. I’ve definitely seen compelling evidence to support both sides of this topic. I plan on doing some testing with my FM9
Good stuff as usual, happy to be a subscriber. Going to have a look a the ejectors on mine now. Can't really remedy the feed cones.
I just put my 1st 9mm together, and it would NOT shoot. I watched this video and did what you said. The thing works like a top now! Thanks
Great presentation. Thank you Sir.
OUTSTANDING GREAT information very clear to the point!!! good to know going into the 9mm AR, been doing Reg 556/300 and this has def opened my eyes to all the upcoming thank you for taking the time to explain
Helpful info. I got lucky!!! I purchased a built Foxtrot Mike AR9 upper and then their factory built lower separately. I put the 2 together and it’s been 100% reliable from day 1. After adding a suppressor, all I had to do is add a heavier buffer. (45ACP) 7.50oz
Going to hit the range today!!!
Enjoyed the vid.
Good to hear! Have fun, be safe!
I’ve reviewed your website in addition to watching your videos. I think I’ll get a Kynshot hydraulic buffer. V’s the KAK.
What’s better….. RB5000HP with 2 extra weights or the RB5015HD with 1 extra weight? For now I will assume it’s the RB5000HP because it adds up to more total mass. Thanks.
You're right, the 5000HP + 2 has better felt recoil. For the correct 9mm bolt travel, they need to be paired with an A5 length buffer tube (7.75" internal). @@scott2228
This is the rout I’ll go. I can’t go longer than A5 bc the gun would no longer fit in it’s dedicated range bag. Lol. A5 will b right. Thanks for all ur help.
Excellent content. This is the best part of youtube, when you learn valuable info. My ARV has been sitting in the safe because of problems that I think I can fix now. Thanks
Swap out the charging handle the one on my arv was out of spec it runs perfect now
Very informative.... Thank you
Thank you for the knowledgeable video
Thanks for putting out this great information. I took your advice and bought the kak gold top buffer. While I was at it, I also bought their 9mm bolt. The bolt costs a little more than other bolts, but has a great feature that I haven’t seen elsewhere. The standard ar extractor has, instead of a roll pin, a partially threaded pin that allows you to easily remove the extractor for cleaning or replacement. I put both in my Colt 6450 and they work great, even fed a mag of hollow points.
Thanks for putting this together. I've been doing things wrong for to long. I some how was able to get a few reliable ar9's. But it wasnt easy. I had know Idea how simple the formula was. Now time to rebuild a couple of may favorites. Thank you. Subbed
Now if I could find someone who has the magic formula to load optimized 9mm carbine reloads. Looking for some 1600-1800 fps 65-90gr projectiles. Basically 9mm stingers.
@@JAM4MOREI think you would have to be weary of throat erosion with those kinds of loadings.
Very good video! 💯👍
Great video I’ve done everything you said but I had to learn the hard way. Found your video a year later.
Thank you for your video. I just bought an AR9 8" barrel. I haven't fired it yet. I check the buffer and its 3 quarter inch long same as what you shown. I think i will buy a new buffer 4" long before going to range .
Built my own a couple years ago doing my own research
Arv builders kit
Macon Deadblow buffer
8" Macon barrel
Franklin armory binary trigger andspring
Feels like a machine gun
Going to Subscribe now for future use after I get my AR9! lol
Thanks!
My epc9 is a frankenrifle.
Sprinco buffer spring for carbine, Aero buffer like you tossed. Foxtrot Mike's bolt, NBS BARREL and LaRue trigger. Larue trigger best ever. No mim used. My first 9mm runs like mad. On magpul mags. Kingslayer with green dot and ring. Odinworks handguard.
First time watching your channel very informative thank you very much keep up the great work. Bought a psa AV9 that throws the empty brass 25 feet at the 1, Oclock position and bottms out the bolt very violently. Thans for the tips
Note when I say "100%", I mean it should feed, fire, and function as reliably as would be expected from a typical quality firearm. No mechanical system runs 100% perfectly 100% of the time. For simple blowback only, NOT for CMMG Banshee! More info: blowback9.wordpress.com/2022/08/18/4-step-guide-to-make-almost-any-ar9-run-100/
What about a good old Glock
Correction, The only firearm that does this is a Glock. 25,000 rounds and have never had a malfunction of any kind. I clean mine after every range session. Alittle over the top but I take pride in all my firearms. My buddies at the range hate me because every time they have a problem they look up at me and I’m just firing away, enjoying life with no issues in my sidearm, your video is excellent. I remember when I first got into the AR9 and had to do the ole quarters trick. Mine runs like a machine now and have upgraded everything accordingly. I love my 5.56 but it’s so expensive. 9mm lets me practice AR controls at the range without spending that ridiculous amount that the 5.56 demands.
I’m guessing we should all give up on the CMMG Banshee? I’m only seeing negative reviews about this gun. Any input??
This dude's information has my PSA AR-V running like a champ. I use the 10oz KAK buffer and $1.75 in quarters in the tube to get my bolt within 1/4" of the bolt catch when pulled back, and it runs. I still plan to get a Macon barrel soon. Thanks!
Great to hear!
I went to the range for testing today. Using the adapter for colt magazines I found that it doesn't like a full 20rd magazine. Seems the bolt was binding up on initial charging. First ten round group ran great. Later on I was having ejection issues but I think it was because my mag adapter was loose. I appreciate all of your videos and hard work.
I’ve tried I don’t know how many magazine adapters, none work. Buy the Mean EndoMags. You have to have a 30 round PMag for them to work. Remove the internals and replace with the EndoMag internals. Flawless.
Awesome!!!
I saw a kit for a colt 9mm smg the other day. Its a colt 9 mm smg that jus has a little square cut out of the lower where the hammer and trigger pins go, and a square cut out where the auto sear pin hole was.
My FM9 does not reliably feed hollow points. In the process now of finding a new barrel. Thanks for the info!
OK, I was having a problem with a Glock 33 round magazine loaded with Berry's 124 gr hp bullets. The bullet would just jam into the bottom edge of the barrel chamber. I replaced the barrel with a Ballistic Advantage 8.3" EPC 9MM barrel. I polished the face for good measure. It now feeds the Berry bullets with no problem. I did notice a little dent on the edge of the bullet but they are softer than jacketed bullets. I am a happy boy. Thanks!
Bro just use FMJ rounds. The tips on HP don’t like feeding ramps much. Besides, why use HPs? More expensive, not reliable at feeding correctly, can’t penetrate cars or body armor. They want you to use HP so you can’t pierce their body armor or vehicles as well. Speaking of ATF agents btw. They are your biggest threat.
Thank you
Welcome!
Great video! Thank you for your service to the community.
I want to share an experience I had. I decided to use a standard AR lower (Spikes) with a magwell insert (from KAK) for a Colt-style magazine. I had two problems; one is the KAK insert is held by two set screws that are inadequate for the job (yeah - I know - I can dimple it - but I don't want to mar the lower). Also, the mag release was not able to engage the magazine very well because the insert created a much thicker wall. The KAK insert, to make matters worse, did not fit tightly. There was quite a bit of air between the KAK product and the lower. So I got a Hahn Precision dedicated magwell insert which fits like a glove and seats tightly. Even with that - the mag release was not engaging enough. I ended up getting the CMMG ambi mag release that extends MUCH further into the magwell and now I have a much better setup. The ambi mag release is also a nice touch. Now, anybody want a free KAK magwell insert? ;)
RRA makes a "9mm" mag release that is contoured so it engages the mag better through the magwell adapter. I just bought 3 and confirmed they sit deeper in the magwell.
big stuff right here thanks! been screwing with mine few years now but I love it. trying to get them short is a problem for me put the Dead foot arms 2.5" brace on and it went nuts on me. changed the trigger stopped the full auto, got a "guaranteed to feed" barrel only feeds flat tips when I add a little oil to the cone although I noticed after the cone dried up it kept running them. so may just need a wear in. I do have a stove pipe or a spent casing left in the chamber causing misfeeds so I did notice the ejector was not snug as your pic. It took me a few times but it looks a little more snug. will try this out at the range tomorrow. I bent a little too much and was hitting one of my dummy rounds causing it to nose up and jam. took a little off seems to be better now. dead foot arms has their "modified cycle system" which is a spring within a spring setup. diff weight springs to play with. I have since stuck with 165gr subs I load myself as they are gentle on the gun and it runs. I stay away from supers just because it seems so ruff on the entire gun. stuff was coming loose at one point the upper pin housing actually broke and angstadt sent me a new one. so running supers with the DFA is a no for me. I might have the spring setup good now and with the trigger correct maybe I can try again but for now it's cushy subs. I run a can and that seemed to magnify the issues as well. thanks for the vid! liked n subscribed sir.
Thanks! Did the ejector adjustment help?
ran perfectly! I mentioned you in my vid published yesterday and put a link to your channel in my description. thanks a lot! @@Blowback9
You bet - thank you!@@magdumpmonday
Great video!!! I bought a Macon Armory "deadblow" buffer, Wilson Combat flatwire carbine spring, and a Cryptic Coating bolt. Total weight is 21 oz. Is that 1 ounce going to present any trouble?
I like to use an Odin works barrel, tool craft bcg, with armaspec buffer. Great combo runs flawlessly with the mean arms magazine conversion.
Odin works has a great adjustable buffer for AR9s as well
Not a ton of rounds yet but my budget build has been 100% so far.
My recipe:
-Spinta barrel and upper receiver
-FM 9mm bolt and buffer
-Standard carbine spring
-Standard Anderson lower receiver
-Standard 556 mags with Endomag 9mm insert.
How is it running I have same endo mag but having feeding issues
@@MrTuna714
No issues yet but only about a couple of hundred rounds so far.
One day I’ll get a dedicated lower for it.
Thank you for taking the time to put out this information!
New to the blowback AR9 world and have recently purchased a Bear Creek Arsenal side charge blowback upper with 16" barrel. Do the same rules apply for the buffer and buffer spring when using a full length buffer tube?
First range trip using the provided buffer & standard AR buffer spring. The side charging handle and was broken off within the first 20 rounds. Just wonder if there's something I'm overlooking.
Not familiar with that upper, but the same rules should apply. I'd need more details - send me an email.
@@Blowback9 Will do, thanks Doug.
Excellent content sir. Much needed information for the frustrated masses. Have you found the feed ramp that is used by Taccom in their barrels to be beneficial? Overkill?
I haven't played with Taccom barrels, but all reports are that their barrel feed ramps work well.
You're sharp
nice
Brownells also has the correct PCC buffer.
Hey BB9, I'm running an 8.5" AR9 suppressed and I recently experienced a double at the range. What buffer spring and buffer do you recommend for my rifle? Thanks!
Hello sir! Love your insight on the ar9 platform!!! I was wondering if I want to add a laser aiming module to an AERO EPC9 would you go with the enhanced upper and handgaurd or do you think the regular threaded will hold up fine?
I'm sorry, but I don't have any experience with their handguards. I'd suspect that either one should hold up just fine, though.
Ive had issues with firing pin springs all being different and causing ftf when to heavy on ar9's. Even had the bolt maker send new lighter springs
This sounds like more than just a FP spring problem. Send me an email or chat on Reddit if you would like help diagnosing. Contact info on my site: blowback9.com
@Blowback9 problem was fixed last year with a different spring. The cause is lack of a shared spec from oem's on what parts to use
Just installed the Wilson Combat flat wire carbine spring in all by ARs 9mm & 5.56. They all had the twang before and it is gone after I installed the springs.
Must use 9MM 10 to 11 oz PCC buffer. (PSA 9MM complete upper). Along with flat wire buffer spring and the Mean Arms EndoMags.
My AR9 is my favorite build so far and runs flawless
Palmetto kit, Aero lower, 8oz buffer, was 4in barrel with kit swapped to 7in CBC ind barrel, law tac folder, Endo mag conversion
How is it running Iam having trouble with my endomag I think it’s feeding issues?
@@MrTuna714 haven't had any notable issues. I'm am swapping to a different buffer soon because I am getting a little bit of bolt bounce
@@DubbinMoto nice I have all the right spring and buffer just can’t get it to cycle or feed properly after the first shot any idea what would make that problem
@@MrTuna714 I have ideas but would need some pictures of your build. We should move this to DMs
@@DubbinMotogot the feeding issues solved the real problem was the ejector is was to low and was not ejecting right the plastic part ejector had to move it up like u mention and solved the problem running ok now haven’t had many rounds but at its working some what !!!
I feel defeated now after watching this because I just realized that the injector on my EPC 9 lower is one of those odd looking ones that looks like an a with a flag on it😢 is there any way to fix that will it still Bend to the right a little bit
My AR9 functioned perfectly for me after getting the heavy buffer and I added a piece of Delrin in the buffer tube to prevent the bolt from over-traveling on recoil. BUT I had a bullet Glock mag lower in my AR9 for the forst 3000 or so rounds. I changed over to a standard AR lower and tried out the Mean Arms 9mm mag conversions and the follow up shot jams straight into the bottom of the barrel, pushing the bullet inside of the case, ruining the round. I'm going to guess that I need a feed ramp. My barrel's feed cone looks to be less than that Colt style feed cone. It looks more like my KelTec Sub2000 feed cone. This feed cone works well with the Glock mags because the Glock mags hold the bullet closer to the chamber and the angle is better in the Glock mag than with the Mean Arms mag conversions.
I assume the back of the 9mm case is unsupported when there is the larger feed cone? Is that the true? If it works, that's fine by me. I was thinking of just using a Dremel to add a feed ramp to the bottom of my barrel and try that. If that doesnt' fix it, I can chuck the barrel in my lathe and enlarge the feed cone.
The cartridge base will have a little less support with a larger feed cone, but I've never had a problem and haven't seen any problems reported with brass ammo.
@@Blowback9 That's good to know. I bought some stainless steel 1/8" drill rod to make an indexing pin for my barrel. I drilled the barrel for the pin and installed it, so the barrel can't spin now. I'm going to try to just Dremel a feed ramp into the bottom of the barrel & see if that works. If not, I can always enlarge the feed cone on the lathe.
This is my first AR9 so maybe there is a reason for the barrel to be extremely thick and heavy? I milled in a couple of flats on the barrel so I can get a wrench on it for taking the muzzle device on and off without damaging the aluminum receiver now that it has an index pin. I was thinking maybe I can turn the barrel down some to lighten it up a bit. As much as I like my AR9, it's a very heavy gun for what it is.
But, I do have a question with all this information great information how will the result be with a suppress system? Because that will be the main goal have it.
Adding a suppressor has the same effect as firing +P ammo. More blowback force. I'd use a heavier buffer, that's all. Everything else the same.
Would you ever consider a heavier spring (IE Kaw Valley XP) when shooting heavy grain (147/158) suppressed?
Heavier springs don't really help and can cause a lot of issues in 9mm AR's. I've tried it and it just makes felt recoil worse. I've found that a heavier buffer is a better option when suppressed.
Thanks again.
Yup, my homebuild ejector was out of alignment, and rounded (PSA, dedicated Colt mag lower). Went ahead and bent it into alignment. and filed the face of it flat and as square as I can get it. It is in much better alignment with the ejector channel/bolt face now.
My Saint Victor 9mm ejector, was already in very good alignment with the ejector channel, but the tip was rounded, so I filed it flat/square, as best I could.
Tidbit about the Saint Victor, it uses a plastic/rubber spacer at the butt end of the buffer spring, with a 3.25" buffer, of unknown weight. It is relatively light recoiling, for that lower mass combo. Wish I knew what spring they use. It doesn't take much force to pull the BCG back. I'd say it takes signifigantly less force to open then my 11oz buffered, flat wire buffer sprung, KVP bolt, home build.
That rubber spacer is similar to what Colt did so they could keep using carbine-length buffers - they stuck a 3/4" spacer in the back of the spring to make up the length difference and to stop breaking bolt catches.
@@Blowback9question, I got an ar9 and the guy before was using the ole quarter trick in the carbine buffer tube. I want to get away from that and turn the machine legit. Will buying the 4 inch buffer do the job or will I also have to buy the spacer in conjunction with the 4 inch buffer weight? Thanks
@@DIXONSIDER00 With a 4" buffer the extra spacer in the back of the buffer spring is not necessary when using a carbine buffer tube.
@@Blowback9 do you have any experience with the spikes tactical st-9x 9mm heavy buffer?
@@Blowback9 it’s 7.7 oz
Man glad I found your video I am having problems with double fires and have replaced the trigger group. It’s a bear creek and I know you get what you pay for lol but it does have a regular buffer that it came with. Would you have any other suggestions or things to try?
I would just make sure to use a carbine-strength spring, a sliding weight buffer, and that the buffer+bolt mass is 22oz or more.
@@Blowback9 ok the one I ordered was I believe 8.3 with a flat carbine spring I also order the Wilson combat spring. I do not have a way to way them at the moment. Thank you for the response
@@Blowback9Iam having a feeding issue do u have a idea was going on I have the endo mags sometime double feed
What about the Geissele braided buffer spring? Do you recommend me changing that to a flat wire with your recommendations?
Testing here: blowback9.wordpress.com/2023/05/02/geissele-super-42/
Can you have a buffer that is too heavy? Would a system too heavy cause the bolt not to cycle far enough to feed another round? Does having a heavy buffer delay the opening of the bolt/chamber to allow for more muzzle velocity?
Try here: blowback9.wordpress.com/2022/09/30/the-overmass-project-worlds-heaviest-9mm-blowback-action/
I use Mean Arms EndoMags, ejector is part of magazine.
Me too are u having any issues
@@MrTuna714 Absolutely none, my son and I have 12 of these between us with thousands of rounds fired. No wear ejectors look brand new.
@@michaelshanahan4965 Iam having feeding issues with my by chance any idea what would be the issue i have right buffer and spring and BCG but can get around the feeding problem
I bought a 9mm kit from PSA a few years ago that I haven't put together yet. I'm guessing that it doesn't have an improved feed cone.
Probably not. However, I'd put it together and test it before doing anything. If it has problems feeding the ammo you choose, then it may be necessary to look into barrels with enhanced feed cones.
Doug, do you know any solutions for an ejector using a 5.56 lower without using the mag well insert kit? I know the Endo mags act as the ejector, but I like the fact the mag has to be in to eject a round.
Unfortunately, the only option I'm aware of is to use a magwell insert with the ejector attached.
@@Blowback9 thanks. With some research, I think the cmmg bolt would work too since it would have an ejector. But I would have to get their barrel also.
is it normal for the rubber portion of the buffer to start to deform like its hitting the end of the buffer tube. i feel like the answer is no, but im not sure. its runs perfect, other than noticing this.
The bumper hits the end of the tube and may deform a little. Keep an eye on it and if it gets too severe, you can replace it. It also depends on the tube. I have one tube with a ledge on the inside of the back cap and it damaged several of my buffer bumpers, but they still work fine.
What are the downsides to using stronger springs such as springco blue?
Here you go!: blowback9.wordpress.com/2021/04/07/the-case-against-308-rifle-recoil-springs-in-a-9mm-ar/
How do you feel about the JP Enhanced Bolt 9mm and the Full Stroke 9mm SCS? I have the BA 8.3 barrel and the Aero EPC 9 upper and lower
Not a fan of most captured systems for 9mm because so many are very underweight. The heavier JP SCS (5H2 or more) paired with the JP bolt do provide enough mass, though.
How about the blowback 9 mm from Springfield Armory with the colt mags?
Not may reports out yet. Time will tell!
I just bought a Foxtrot Mike lower and a PSA 8" upper. I got a 7.5 oz Macon Armory dead blow buffer and standard carbine spring. I've shot about 100 rounds including 115gr fmj, 147 gr fmj and HST 147 gr HP. It has run flawlessly so far. I noted the buffer + bolt is just under 22 oz and the ejector is slightly away from the bolt and down some in the ejector groove. There is copper rub marks on the chamber face of the barrel. I am thinking if it ain't broke don't fix it but it would also be very easy to install a Ballistic Advantage barrel, just in case. I also have a YHM R9 suppressor waiting on a tax stamp. I wonder if I should get a heavier buffer. Flat wire buffer spring is on the way.
Yes, if it ain't broke, don't fix it! Just be aware that if you have ejection problems the ejector may need tweaking. If the total mass is near 22oz, it should be fine!
I ordered the Ballistic Advantage EPC 8.3" barrel. I replaced the PSA forend with a Dirty bird 7" one so I know how easy it is to change the barrel.
I have a FM lower and a PSA 16" upper. I switched to a used carbine spring and an 8.3oz sliding-weight buffer for a total weight of 22.5oz. After making that change and testing it with a box of ammo, we took it to Steel Challenge where my wife and I averaged about 175 rounds each without a hiccup using Blazer brass 115gr. I also noticed that the ejector is sitting a little low, but it extracts fine. (Well, there are some brass marks on the upper part of the ejection port.) I wonder how easy it is to adjust.
The only problem we had before was with loading new 33-round magazines too full. (28 to 30 rounds seems to work.) Ammo would get smashed into the lower part of the chamber face or whatever it's called. The odd thing is that it seemed to need to be loaded even less with 124gr and even less with 147gr. I'm guess ammo mass had something to do with that, and I wonder if the fast moving bolt was part of the reason in addition to the stiff springs in the magazines. The reciprocating mass was 20.6oz with a .308 spring, so the bolt was flying home in a hurry!
Pretty much set up I’m working on, the lower pair up with the PSA ok? Is it running better with the barrel upgrade, any new rub marks? Thanks!
Is the percieved felt recoil softer with the gold top (heavy) or the blue top (heavier)
Blue top by a little bit.
On a Foxtrot FM9 can the barrel be swapped to a new barrel of any length without making any other changes?
It should be able to be swapped with a different blowback 9mm barrel.
What about pistol length buffers? Any input there. Looking to build one.
Honestly, my AR-9 rocks a standard carbine with buffer and spring. Zero issues over the years. The only complaint I have is it doesn’t have LRBHO feature. I’ve trained to recognize the difference in feel when the bolt locks back, but I built it so long ago. LRBHO wasn’t a thing yet. Even today I’d probably not buy a lower with LRBHO feature - they’re pricey, and my builds are quality on a budget.
Draco 9s smooth af
AR9 jumps around like a hip hop concert
Check the "Gentle Recoil System" video/pages. It really calms down the AR9.
Unfortunately I can no longer pick up a Glock magazine lower in my state. What brand of Glock magazine adapter do you prefer?
I don't care for the Glock adapters because they move the mag release. I use Colt mag. adapters. I tried a Stern Glock and it worked pretty well, but the ejector is not adjustable. Sorry I can't be more help.
@@Blowback9 appreciate your input and they understand the reason for your preference. Dad said if you're going to base a whole channel around 9 mm are based pccs you probably should be able to form an opinion on solutions for the most popular magazine for that format.
Am I frustrated with my AERO EPC inability to reliably load HP ammo? That’s putting it lightly. I even tried new BA barrel with enhanced feeding cone a few months back, but it’s still a no-go. I’ll next try the Gold Top Buffer. BTW….I tried Damage Industries Enhanced Buffer Springs in my other ARs and they’re also pretty darned quiet.
Sorry you're having so much trouble. Try a standard carbine spring as well. You may need Macon Armory's EPC mag catch - check it out. Worst case, Critical Duty/Defense should feed. The DI enhanced are quieter with regular buffers, but they resonate terribly with hydraulic buffers in my tests. Flatwire seems to work better with hydraulics.
Im having a problem with my ar45 . It seems that the bolt is out running the mag ....
Tip up malfunction.... 😊
Talk to Rudy at Macon Armory. He's a .45 AR expert.
What is it about flat nose and hollow points that causes an ar9 to malfunction in that same "nose high smile imprint" fashion?
Magazine height and cartrige presentation angle. Things are a little out of alignment. The enhanced feed cone helps compensate for these little alignment problems.
I just bought an Arv literally 3 days ago and it doesn’t get passed a one shot before feeding issues. I’m so pissed I bought cheaper guns that ran smoothly
If it is purely a feeding issue have you tried polishing the feed ramp?
Does any of this apply to my ar40?
The same principles should apply for the spring, feeding, and ejection. The total mass probably needs to be higher for a .40, but I don't know what it should be.
Question. I doubt I'll get an answer as it's kind of out of date at this point but I may as well ask.
How much of this applies to an AR45?
I've got this AR45 monstrosity that I've been working on for the past couple years and have largely worked out most of the kinks. But, about 1 out of every 10 rounds jams up. Not like in a catastrophic way, but like the round binds up during the feed and into the chamber. Still kind of running down the list of possible fixes.
Feeding from Colt/Uzi 45 mags via magwell adapter with the feed ramp, KAK weighted bolt, Aero EPC buffer. I want to try a 308 carbine buffer spring next because I know 45 is punchier than 9mm and the bolt speed might be trying to feed the rounds too fast
Almost all of it applies except mass. .45 needs more. A .308 spring will increase cyclic rate and feed the rounds even faster - it has more return pressure. Instead, the buffer needs to be heavier. I'm surprised you're not having case blowouts with a 7.7oz buffer. Try a KAK or MidwayUSA 10oz. (on sale): www.midwayusa.com/product/1019567610?pid=867078 Last resort - contact Macon Armory, ask for Rudy. He'll get it running 100%.
I'll start with a KAK buffer because I'm always ordering from them anyways. I'm also curious if the feed ramp is a touch too tall because it was designed for 9mm.
Thanks for your input!
Great video, I am running into ejecting issues with my build. I purchased Davidson Defense "Patras" AR-15 Pistol Upper Receiver 4" 9MM 4150 CMV QPQ Nitride 1-10T Barrel 4" M-Lok Handguard along with the Aim's 9mm lower with Glock 17 mags. I have tried different ammo and still every other shot stove pipes etc. The buffer that came with the kit was the one you said to throw in the trash. LOL Would you recommend changing the buffer?
Yes, I would change the buffer, but ejection issues are usually related to the ejector's position in the bolt channel it rides in. I cover that in the video. If the ejector tip can be adjusted so it's snug in the corner of the bolt channel, that usually fixes it.
Okay, I did order the Kak Gold buffer you suggested and will take a look at the ejector. Thank you
After looking at the ejector, it is low. I do have the 2 allen screws on the side of my lower to remove the ejector. The problem is there is a hole in the ejector where one of the set screws goes through. So it stops me from raising the ejector up to where your saying it should be hitting on the bolt. Would you suggest drilling the hole on the ejector a little larger or? I could email you pictures if you want. Thank you
Send me an email and I'll get you some details of another possible option!@@markr6937
I wonder if anyone had this issue. I bought a basic KAK carbine buffer spring. It's chrome silicon with black oxide and it feels like fine sandpaper! It feels like basic rust to me! Will that smooth out quickly before it wears away at the other buffer parts?
Technically, it IS rust, just Fe3O4 instead of the red Fe2O3 common rust. It's more stable and provides corrosion resistance against red rust. Keep it oiled and it should be fine.
@@Blowback9 I tumbled it for an hour with stainless steel pins. It's smoother and oiled now. How resistant to red rust is chrome silicon? EDIT: I just read that it's similar to other basic steels if it isn't oiled or otherwise coated.
On a 4” barreled upper would you reccomend a heavy buffer or lighter buffer since the round will be in the barrel for less time creating less pressure? Also I’m looking at the roller delay buffer would that be better than a tradition buffer? What do you recommend?
If everything is configured properly, a heavier buffer will work fine and will have a greater effect on felt recoil with a shorter barrel. I was able to run the equivalent of a 22oz buffer with a 2.5" barrel, so a 4" barrel should have no problem with any heavy buffer.
@@Blowback9 I hate to bother you again but I have another question. Have you ever shot +p or +p+ ammo through any of your ar9s? I’m concerned about the reliability of using ammo of that sort with my ar9. I would not use it regularly but I have the potential to use the pistol to hunt on occasion and would like to use the ammo for that.
+P should be OK as long as running sufficient mass (22oz. or more) but watch for case bulging - if found, add more mass. +P+ is NOT recommended! +P+ just means "more than +P" and can be anything from spicy to dangerous.
@@Blowback9 thank you I will definitely avoid the +p+ I’m running a 10oz buffer with a weighted bolt so I should be 22-24oz roughly so sounds like +p will be safe. I’ll keep an eye out for bulging as well.
Any experience running vltor a5 buffers?
Not directly, but reports are that they work for 9mm as-is in a carbine buffer tube since they're 4" long.
My colt runs very well .
I am having trigger resetting issues . It fires and ejects and chambers next round but trigger will not reset have kak buffer and spring. Mil spec trigger group what would you suggest thank you for your help
The first thing I would do is check the mil-spec trigger group springs. If the hammer spring is installed backward (easy to do) or the disconnector spring is upside down (fat side goes down), the hammer may slip off the disconnector and follow the bolt home instead of staying caught on the disconnector.
Ok I will double check all that ty for the help and all your knowledge on the 9mm AR..👍
Interesting, this is one of the reasons some manufacturers say to use the solid buffer with the 308 spring. They say otherwise there isn’t enough time for the hammer to reset
I’ve seen compelling evidence to support both sides, it seems like this is one of those cases where you have to decide which quirks you want to deal with
I know FM products are lifetime warranty so as long as they cycle reliability and it goes bang when I pull the trigger then good enough for me. If the 308 spring breaks the bolt catch or something then warranty should cover it
It's not the fact that FM's buffer is solid that helps the hammer reset with the overpowered .308 spring. Their proprietary solid buffer is 0.2" shorter = more time to reset. Instead of having to design a proprietary buffer, they could have just used a standard spring.@@americanbigfoot7881
Been using the Endomag, everything ran great for the first 100 rounds then it started double feeding and not ejecting properly
I think Endomags are a bit sketchy for 9mm conversion, but they just released their new Exomag. I ordered one for testing.
That’s what my endomag is doing on mine did u find out what the problem was ?? By chance
How sure are you on ghost firearms having an enhanced feed ramp I just ordered my elite upper and it’s flat
The photos I have and reports from other buyers show an enhanced feed cone that feeds hollow points just fine. They may have changed something recently?
I just received updated pics from another owner who has a new one and one from a year ago - it looks like they changed it very recently - I'll need to add a note to the description.
@@Blowback9 yea I noticed they didn’t say it had one, I was hoping I could have sent mine back to get the enhanced feed ramp, awesome video thank you for making great content!
Taccom ulw barrel short stroke bolt and air buffer and you will be shooting 22 recoils😊
What's an air buffer?
I'll look into it. Check out the Gentle Recoil System on my site.
I just used a off the shelf barrel..runs everthing i throw at it
Congratulations! Sometimes everything lines up just right.
"AR-9s are picky and difficult to make operate properly. Here's a guide to tuning them..."
Me, with a 3d printed lower and random lowest cost parts thrown together from 4 different suppliers: "Haha AR-9 go pew pew pew"
Nice! Sometimes it all just comes together perfectly.
Put axle grease on your spring, it won't ring!
It's messy, but that will work!
Ppl.would probably freak out if they knew how i put mine together..lol..had problems but did watch another video about problens...follwed it pefect and never had anymre problems...put a stack of quarters in my buffer tube..problem solved..
You want 100% reliability? Easy!
Step #1: Sell your existing problematic AR-9.
Step#2: Use money from Step #1 to buy a Springfield Saint Victor 9mm.
Step#3: You’re done. Enjoy!
I haven't seen many reports yet. It would be nice if there was a factory 9mm AR that was actually very reliable. Time will tell!
@@Blowback9 I’ve had mine since last Fall and have zero malfunctions. My buddy has one as well and it has been completely reliable for him, too.
I just recently installed a Kynshot RB5015HD and Wilson Combat flat spring. Factory bolt and buffer weight was 20.9oz. With the Kynshot buffer and bolt: 21.5oz. Haven’t tried shooting it yet with mods, but hopefully soon.
Nice! Let me know how it goes!@@wisco_guy
@@Blowback9 Just shot it this morning and it worked perfectly. There was a noticeable difference in recoil being slightly less than in the factory configuration.