The Colt M231 Port Firing Weapon, a specialized variant of the AR-15 platform, was designed for the M2 Bradley Fighting Vehicle. It operates from an open bolt at a high rate of fire (1100-1200 RPM) and features significant modifications from a standard M16, including a unique recoil system and simplified fire control. Lacking traditional sights and a stock, it was intended for use within the vehicle, firing through dedicated ports.
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