Sons of Liberty Gun Works BCG 5.56 Phosphate Black – AR-15/M16

The Sons of Liberty Gun Works 5.56 Bolt Carrier Group is a mil-spec replacement or upgrade for AR-15 and M16 platform rifles. Designed to handle the pressures and cycling demands of 5.56 NATO and .223 Remington, this BCG delivers reliable function for duty, competition, or defensive applications. Whether you're replacing a worn component or building a new upper, this carrier group provides the core reliability your AR platform depends on.

The carrier is machined from 8620 steel with a traditional phosphate finish for corrosion resistance and lubricity. The bolt is made from 9310 steel, properly staked and MPI (Magnetic Particle Inspected) to ensure structural integrity. Gas key is secured with Grade 8 fasteners and properly staked. This is a drop-in component for standard AR-15/M16 upper receivers—no gunsmithing required, though proper headspacing should be verified when installing any new BCG.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15, M16 (5.56 NATO/.223 Remington)
• Carrier Material: 8620 Steel
• Bolt Material: 9310 Steel, MPI Tested
• Finish: Phosphate (Black)
• Installation: Drop-In (Verify Headspacing)
• Includes: Bolt Carrier Group Complete