The Colt CMG-3 is an extremely rare 7.62x51mm belt-fed light machine gun developed in the early 1970s. Despite its innovative features like a sliding pistol grip charging mechanism and a symmetrical firing pin, it failed durability testing due to receiver cracking, falling short of the 100,000-round service life requirement. The CMG-3 was a successor to the 5.56mm CMG-2, which also lost out to the Stoner 63 in Navy SEAL trials.
The Colt CMG-2 is a rare, belt-fed 5.56mm light machine gun prototype developed by Colt. It features a unique sheet metal receiver, a cam-driven feed mechanism inspired by the PKM, and an unusual bolt without a traditional extractor. The pistol grip assembly serves as the cocking mechanism, and a hydraulic buffer manages recoil.
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