This guide details the disassembly of the Colt M231 Port Firing Weapon, a specialized variant of the AR-15 platform. Expert Ian McCollum highlights its unique features, including an open-bolt operation, a striker-fired system replacing a hammer, and a complex triple-nested recoil spring assembly. The M231 was designed for mounting in vehicles like the Bradley M2 Fighting Vehicle, featuring modifications for this specific role.
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