Why is my PSA Rock 5.7x28 so ammo picky?

I check out the PSA rock and my two barrels from @PalmettoStateArmoryVideos and use a case gauge from Sheridan Engineering and Elite Ammunition. Also comparing my S&W M&P 5.7 I can see that the Rock barrels are chambered a little tighter and this, with some ammo can cause reliability issues.
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‪@BuffRANGE‬ ‪@ShastaBean‬