Colt's Manufacturing 5.56 Bolt Carrier Group – AR-15/M16 Platform

The Colt 5.56 Bolt Carrier Group is a factory replacement or spare BCG for AR-15 and M16 platform rifles. Built to Colt's mil-spec standards, this bolt carrier group delivers the reliability shooters expect from one of the most established names in the AR platform. Whether you're replacing a worn BCG, building a spare, or assembling a new upper, this unit provides proven performance for 5.56 NATO and .223 Remington chamberings.

Manufactured from high-quality steel with a phosphate finish, this BCG features proper staking, shot-peened components, and magnetic particle inspection. The carrier is machined to mil-spec dimensions for consistent function with standard AR-15 lower receivers and buffer systems. Installation is drop-in for those familiar with AR-15 disassembly and maintenance—no gunsmithing required, though proper headspacing should always be verified when installing any new bolt.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15, M16, 5.56 NATO/.223 Remington chamberings
• Material: Steel
• Finish: Phosphate
• Installation: Drop-In (verify headspace)
• Includes: Bolt, carrier, cam pin, firing pin, retaining pin