The CZ 805 BREN is a gas-operated modular assault rifle designed and manufactured by Česká zbrojovka Uherský Brod.

The CZ 805 BREN is used by various police and military forces, including in the Czech Republic, Indonesia, and Mexico.

Czechoslovakia had the distinction of being the only Warsaw Pact member whose army did not issue a rifle based on the Soviet AK-47/AKM.

58 in the late 1950s and although it fired the same 7.62×39mm cartridge and externally looked similar, its operating system and features were dramatically different.

Shortly after that time however, the Cold War was ending and Czechoslovakia's communist party had stepped down following the Velvet Revolution.

By then Česká zbrojovka Uherský Brod, which had taken over the design, had become privatised, and the company shelved the weapon for several years.

[3] In the late 1990s, the Lada project was restarted with the prospect of the Czech Republic becoming a full member of NATO.

The Army still did not wish to buy a new rifle for the entire military, but special forces did receive Bushmaster M4A3 carbines.

With the prospect that the Army would re-arm gradually rather than on a large scale, CZUB drew up entirely new specifications in late 2005.

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.

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.

In November 2016, the Czech Army received its first batch of CZ BREN 2 modular assault rifles.

[9] On 29 September 2023, the Deputy Minister of Defense of the Czech Republic, Daniel Blazhkovec announced that Ukraine will receive a license to produce CZ BREN 2 rifles.

These rifles will be produced under the Sich (Січ) brand, while Sellier & Bellot will set up an ammunition factory in Ukraine.

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.

Other notable features include a chrome-lined, hammer-forged barrel, an ambidextrous, folding, non-reciprocating charging handle, a forward assist, a bolt release integrated into the trigger guard, dual plunger ejectors, and an anti-bump system to prevent malfunctions.

Constructed from lightweight aircraft-grade 7075-T6 aluminum alloy and carbon fiber polymer, the BREN 3 weighs approximately 3 kg.

The CZ BREN 2 DMR is chambered in 7.62x51 NATO cartridge, overall length is 1300 mm, barrel length 457 mm (18 in), weight 4.6 kg, effective of range 600–800 m.[21] It has replaced the SVD Dragunov and SVDN-3 Tiger rifles in selected units of the Czech armed forces.