The Kalashnikov AK-101, AK-102, AK-103 and AK-104 assault rifles are the modern versions of the world famous Kalashnikov AK-47 assault rifle developed for firing 5.56mm and 7.62mm cartridges. They have retained all the qualities and merits traditionally inherent to the AK, AKM, AKMS and AK-74M weapons. In addition, the assault rifles of the AK-100 series have the following design features: an attachment for mounting under-barrel grenade launchers, a folding plastic butt and a standard mounting rail for installation of optical and night sights; a more sturdy breech locking assembly allowing the use of new higher-performance cartridges; lower total weight of simultaneously moving parts and a muzzle brake-compensator, which provide reduced recoil momentum, increased weapon stability upon firing and lower fire dispersion in automatic fire mode.