For the domestic Army Replacement Rifle program development, the Lada was re-designated Project 805.
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.
Project 805 became the CZ XX, and then the CZ S805.

Two types of guns were drawn up: 'A' models chambered for intermediate rounds including 5.56×45mm NATO, 7.62×39mm, and 6.8mm Remington SPC; and 'B' models chambered for rifle rounds like 7.62×51mm NATO and even .300 Winchester Magnum.

All had three barrel lengths to act as a rifle, close quarters carbine, and designated marksman rifle/LSW.
A CZ S805 was presented to the Army chief of staff in November 2006, but still was not ordered.
CZUB then presented the weapon publicly and spent three years showing it at exhibitions.
It wasn't until November 2009 that the Czech Army finally released a tender for a new infantry rifle.

The company reduced its modularity for the competition and submitted a 5.56 mm rifle (A1) and 5.56 mm carbine (A2), as well as similarly configured 7.62 Soviet-chambered guns.
This was eventually reduced to just the 5.56 mm system.
When the tender was released, 27 weapons were submitted, but were reduced to just the CZ 805 and FN SCAR-L. The CZ 805 won narrowly from emphasis on a domestic design and the result was made public on 1 February 2010.
FN Herstal did not contest the decision, and the CZ 805 was officially ordered on 18 March 2010: 6,687 CZ 805 BREN A1 assault rifles; 1,250 CZ 805 BREN A2 carbines; and 397 CZ 805 G1 proprietary grenade launchers.
Every one was equipped with Meopta ZD-Dot red dot sights and iron sights.
For special forces, 1,386 enhanced optical suites consisting of Meopta's DV-Mag3 daylight 3× magnifier, NV-3Mag night 3× magnifier, and a DBAL-A2 (AN/PEQ-15A) laser target designator were also ordered.

In May 2010, the Army requested changes to the design before it could be operational including the change from a folding and telescoping stock to just a folding one, a pin-stabilised magazine well, a pistol grip with changeable backstraps, and the change from a 7-lug bolt to a 6-lug bolt.
The first delivery of the CZ 805 occurred on 19 July 2011 with 505 guns and 20 grenade launchers.
The initial order was to be completed in 2013.
For the domestic Army Replacement Rifle program development, the Lada was re-designated Project 805. 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. Project 805 became the CZ XX, and then the CZ S805.
Two types of guns were drawn up: 'A' models chambered for intermediate rounds including 5.56×45mm NATO, 7.62×39mm, and 6.8mm Remington SPC; and 'B' models chambered for rifle rounds like 7.62×51mm NATO and even .300 Winchester Magnum.
All had three barrel lengths to act as a rifle, close quarters carbine, and designated marksman rifle/LSW. A CZ S805 was presented to the Army chief of staff in November 2006, but still was not ordered. CZUB then presented the weapon publicly and spent three years showing it at exhibitions. It wasn't until November 2009 that the Czech Army finally released a tender for a new infantry rifle.
The company reduced its modularity for the competition and submitted a 5.56 mm rifle (A1) and 5.56 mm carbine (A2), as well as similarly configured 7.62 Soviet-chambered guns. This was eventually reduced to just the 5.56 mm system. When the tender was released, 27 weapons were submitted, but were reduced to just the CZ 805 and FN SCAR-L. The CZ 805 won narrowly from emphasis on a domestic design and the result was made public on 1 February 2010. FN Herstal did not contest the decision, and the CZ 805 was officially ordered on 18 March 2010: 6,687 CZ 805 BREN A1 assault rifles; 1,250 CZ 805 BREN A2 carbines; and 397 CZ 805 G1 proprietary grenade launchers. Every one was equipped with Meopta ZD-Dot red dot sights and iron sights. For special forces, 1,386 enhanced optical suites consisting of Meopta's DV-Mag3 daylight 3× magnifier, NV-3Mag night 3× magnifier, and a DBAL-A2 (AN/PEQ-15A) laser target designator were also ordered.
In May 2010, the Army requested changes to the design before it could be operational including the change from a folding and telescoping stock to just a folding one, a pin-stabilised magazine well, a pistol grip with changeable backstraps, and the change from a 7-lug bolt to a 6-lug bolt. The first delivery of the CZ 805 occurred on 19 July 2011 with 505 guns and 20 grenade launchers. The initial order was to be completed in 2013.
CZ 805 BREN