The CZ 805 BREN modular assault rifle is a gas-operated (short-stroke gas piston) selective fire self-loading rifle with a rotating breechblock and cold hammer forged chrome lined barrel manufactured by CZUB[1]. The modular design currently enables users to change the caliber of the weapon to 5.56x45mm or 7.62x39mm intermediate cartridges by quick change of barrel with gas tubes, breech block, magazine bay and magazine.[2]

CZ BREN is a series of assault rifles and battle rifles, namely the CZ 805 BREN, CZ 807 and CZ BREN 2, created by Česká zbrojovka Uherský Brod in 2006 to replace the Sa vz. 58 in the Czech Army. The CZ 805 BREN is used by the Czech military, Indonesian special forces and Mexican police. In 2014, Slovak Army began to replace its vz. 58 rifles with CZ 805 BREN. In November 2016, the Czech Army received its first batch of CZ BREN 2 next generation assault rifles.[3][4] 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.[5] The CZ BREN 2 in 7.62×39mm was also issued to Egyptian airborne forces and Republican Guard in 2017 and 2018 respectively.[6]