Colt Machine Gun
The Colt Machine Gun or CMG was an open bolt belt-fed machine gun that fires 5.56×45mm cartridges designed by Colt Manufacturing Company in 1965. Colt hastily developed the CMG-1 to complement the CAR-15, a Colt branding of the M16 rifle, so that Colt might offer both of them as an alternative to the Stoner 63 weapons system.