MIL-M-63356A, MILITARY SPECIFICATION: MACHINE GUN, 7.62MM: M240C (21 APR 1981) [NO S/S DOCUMENT]., This specification establishes the performance, design, development, manufacturing, packaging and quality assurance requirements for onetype of 7.62 millimeter (MM) gas operated, air cooled, link belt fed,light weight, machine gun furnished with one spare interchangeable barrelassembly in carrying case and one ruptured cartridge case extractor.This machine gum is for use as a coaxial weapon in-tank application orother vehicle.