The CZ 805 BREN is a Czech assault rifle created by Česká zbrojovka Uherský Brod (CZ) in 2006 to replace the Sa Vz. 58 in the Armed Forces of the Czech Republic. In 2017, French GIGN received 68 CZ BREN 2 assault rifles chambered in 7.62×39mm and is expected to order more, in order to replace most of its Heckler & Koch HK416. In 2014, Slovakia began to replace its Sa Vz. 58 with CZ 805 BREN in the armed forces. In November 2016, the Czech Army received its first batch of CZ BREN 2 next generation assault rifles.
The CZ 805 BREN utilizes a well-proven locked breech principle with rotating breech block and its automatic function is driven by combustion gases tapped from the barrel with option of two-stage regulation of piston mechanism. The weapon is gas-operated and features a rotating bolt and a manual gas regulator.
The CZ 805 BREN assault rifle is fitted with folding iron sights, but also includes an integral Picatinny rail on top of the receiver and is capable of accepting a wide variety of additional sighting equipment (red-dot or telescope day sights, night sights, lasers etc.). The weapon is equipped with side-folding buttstock, which is adjustable for length of pull, and can be completely removed if maximum compactness is required. Additional equipment also includes a new, specially designed 40 mm underbarrel grenade launcher and a bayonet.
The fire control unit includes ambidextrous safety/fire selector switch, which permits semi-automatic, 2-round bursts and full automatic fire. Charging handle can also be installed on either side of the weapon, depending on user preferences. The CZ 805 BREN has two barrel lengths. A 360 mm (14.2 inch) barrel length for the standard assault rifle variant, the CZ 805 BREN A1 and a 277 mm (10.9 inch) barrel for the carbine variant, the CZ 805 BREN A2. The barrel is chrome-lined to ensure a very high accuracy and durability.
The rifle features a magazine housing which is a separate detachable unit. Which can be replaced easily to allow the use of STANAG or HK G36 5.56×45mm NATO magazines. It is also capable of housing a 5.56×45mm NATO 100-round Beta C-Mag. In standard configuration, the CZ 805 BREN uses a 5.56×45mm NATO proprietary 30-round magazine made of transparent polymer which is made by CZ.
In October 2015, CZ announced that it had introduced an improved, lighter variant of its 805 Bren rifle – called the 806 Bren 2 – with significantly improved ergonomics and functionality. It incorporates a number of amendments requested by the soldiers in the field, including a reduction in weight of .5 kg (1.1 lb), a re-designed cocking mechanism, a simpler cleaning routine and a new lightweight folding and adjustable foot. In January 2016 the Czech Army confirmed that they had signed contracts with CZ for 2,600 CZ 806 Bren 2 rifles and 800 CZ 805 G1 underbarrel grenade launchers. The decision about the purchase had been taken in late October 2015 under an urgent requirement procedure because of new security threat and the migration crisis within Europe and Egypt.