ČZ 2000 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 . 45x39mm M74 cartridge to the standard NATO 5 . 56x45mm round with the SS109 bullet . ) J . Denel from the Brno - based Prototypa - ZM company is the chief designer for both systems . The ČZ 2000 ( short for " Česká zbrojovka " , and the number 2000 signifies that this is a weapon system of the year 2000 ) was to be produced by Česká zbrojovka of Uherský Brod . It was to be the new service weapon of the Czech Army , replacing : the 7 . 62 mm vz . 58 assault rifle , 7 . 65 mm vz . 61 Škorpion submachine gun and 7 . 62 mm vz . 59 machine gun . As of 2007 , the project has been discontinued . Design details . The firearms of the ČZ 2000 series family fall under the category of automatic weapons - selective fire , gas - operated and locked with rotary bolt mechanism . Cartridge casings are extracted from the chamber with a spring - loaded claw extractor and ejected by a protrusion in the receiver housing . The system uses a hammer - type striker and a trigger assembly equipped with a manual fire control selector ( the fire selector lever is located at the left side of the receiver , just above the pistol grip ) , that enables semi - automatic fire ( selector switch in the “ 1 ” setting ) , continuous fire ( “ 30 ” ) and three - round burst mode ( “ 3 ” ) . The fire selector lever also operates the external safety mechanism ( lever in the “ 0 ” position – weapon is safe ) . The rifle features an internal safety . The ČZ 2000 family is fed from a curved box magazine molded from a translucent polymer material and has a 30 - round cartridge capacity and an empty weight of 0 . 17 kg . The ČZ 2000 series of weapons are equipped with a synthetic pistol grip , a side - folding metal wire stock ( folds to the right side ) , adjustable iron sight s ( closed peep - type ) with an aperture placed on a sliding drop arm that has the following range settings : from 100 to 800 m – in the carbine and standard rifle versions and from 100 to 1000 m – in the case of the light machine gun variant . Night - time operation of the weapon is enhanced through the use of three self - luminous aiming dots , two of which are located on extensions in the rear sight , and the third – at the base of the front sight post . The light machine gun variant features a standard side rail fastened to the left side of the receiver , used to mount optics , which can also be installed optionally on the carbine and rifle variants . The ČZ 2000 system weapons share a high degree of parts commonality , and differ mainly with regards to barrel length and certain minor components , i . e . both the rifle and light machine gun are fitted with a slotted “ birdcage ” flash suppressor , whereas the carbine has a conical flash hider . Furthermore the carbine features a shorter ( than the rifle and LMG ) piston operating rod , gas cylinder and handguard . The rifle and LMG can be fitted with a bipod ( attached to the muzzle end of the barrel , folded under the barrel ) and the rifle can also be used to mount a bayonet and under - slung grenade launcher ( the designers did not envision the need for launching rifle grenade s ) . The weapon was to be supplied with a standard set of magazines and accessories with 6 magazines , a magazine pouch , sling , sight adjustment tool , cleaning kit and segment cleaning rod .