Light Machine Gun Type 56M (RPK)
The RPK differed from the AKM in many design features: the barrel was extended and the muzzle velocity increased; the magazine capacity was increased to extend sustained fire;a folding bipod was provided to improve shooting accuracy;windage adjustment was added to the sights; the stock was the same as that of the Tegegarev RPD machine gun, and a folding wooden stock RPKS was developed for airborne troops.