How a CZ 805 Bren S1 Rifle Works

Wikipedia:
The CZ 805 BREN is a gas-operated modular assault rifle designed and manufactured by Česká zbrojovka Uherský Brod. The modular design enables users to change the calibre of the weapon to 5.56×45mm NATO or 7.62×39mm intermediate cartridges by quick change of barrel with gas tubes, breech block, magazine bay and magazine.
The CZ 805 BREN was created to replace the Sa vz. 58 in the Czech Army in 2006, which later sprung a family of rifles; CZ 807, CZ BREN 2, CZ BREN 2 BR and CZ BREN 2 PPS.
The CZ 805 BREN is used by various police and military forces, including in the Czech Republic, Indonesia, and Mexico.
Type Carbine
Assault rifle
Battle rifle
Designated marksman rifle
Place of origin Czech Republic
Service history
In service 2011-present
Used by See Users
Wars
War in Afghanistan
Mexican Drug War
Mali War
2022 Russian invasion of Ukraine
Production history
Designed 2009
Manufacturer Česká zbrojovka Uherský Brod
Specifications
Mass 3.6 kg (7.9 lb)
Length
CZ 805 BREN A1:
875-930 mm (34.4-36.6 in) (buttstock extended)
670 mm (26 in) (buttstock folded)
CZ 805 BREN A2:
792-847 mm (31.2-33.3 in) (buttstock extended)
582 mm (22.9 in) (buttstock folded)
Barrel length 360 mm (14 in) (CZ 805 BREN A1)
277 mm (10.9 in) (CZ 805 BREN A2)
Cartridge 5.56×45mm NATO(CZ 805 BREN, CZ BREN 2)
7.62×39mm(CZ 807, CZ BREN 2)
7.62x51mm NATO(CZ BREN 2 BR, CZ BREN 2 PPS)
Action Gas-operated, rotating bolt
Rate of fire 760 (±100) rounds/min
Effective firing range 500 m (CZ 805 BREN A1)
400 m (CZ 805 BREN A2)
800 m (CZ BREN 2 PPS)
Feed system 30-round proprietary box magazine (CZ 805)
STANAG magazines (CZ BREN 2)
Sights Iron sights and Picatinny rails for various optical sights

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