Machine gun infantry “KT-7.62”

A machine gun comprising:

• a barrel having a barrel wall,
• a receiver assembly having a cover,
• a receiver base and a butt;
• a lock frame having an extractor and a gas piston;
• a bolt,
• a return mainspring with guiding bar;
• a gas piston tube;
• a flash absorber;
• a trigger mechanism;
• a gunsight;
• a butt sighting appliance;
• and
• a trigger pull and magazine, where:
• the barrel is made of steel preform produced of steel doped with chromium, molybdenum and vanadium, the steel containing (% by weight):
• mang-
• Moly-
• vana-
• carbon
• silicon
• anese
• chromium
• bdenum
• sulphur
• dium
• 0.41 to
• 0.20 to
• 0.60 to
• 0.8 to
• 0.15 to
• 0.04 to
• 0.2 to
• 0.49
• 0.35
• 1.00
• 1.15
• 0.4
• 0.09
• 0.3
• the barrel being coated inside.