CMMG Bolt Carrier Group M16 5.56 – AR-15/M16 Platform

The CMMG M16 Bolt Carrier Group delivers reliable cycling and extraction for AR-15 and M16 platform rifles chambered in 5.56 NATO/.223 Remington. This full-auto profile carrier provides increased mass over standard semi-auto carriers, contributing to smoother operation and improved reliability with a wide range of ammunition weights and gas system lengths. Ideal as a replacement BCG or for builders looking for proven performance in a new upper assembly.

Machined from 8620 steel with a manganese phosphate finish on the carrier and a shot-peened Carpenter 158 steel bolt, this BCG is built to mil-spec dimensions for drop-in compatibility with standard AR-15 upper receivers. Gas key is properly staked. No gunsmithing required for installation—simply insert into upper receiver and charge. Includes ejector, extractor, firing pin, cam pin, and gas key pre-installed.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15, M16 (5.56 NATO/.223 Rem)
• Carrier Material: 8620 Steel
• Bolt Material: Carpenter 158 Steel, Shot-Peened
• Finish: Manganese Phosphate (Parkerized)
• Profile: Full-Auto (M16)
• Installation: Drop-In
• Includes: Bolt, Carrier, Firing Pin, Cam Pin, Ejector, Extractor, Gas Key (Staked)