The ČZ 2000 is a prototype 5.56 mm caliber Czech weapon system, consisting of a standard rifle, carbine and light machine gun. The system was developed in 1991 after adapting the LADA firearm prototype (chambered for the 5.45×39mm M74 cartridge to the standard NATO 5.56×45mm round with the SS109 bullet.) J. Denel from the Brno-based Prototypa-ZM company is the chief designer for both systems.