LBE Unlimited AR Bolt Carrier Group – AR-15 / M16

The LBE Unlimited AR Bolt Carrier Group is a direct replacement for worn or damaged BCGs in AR-15 and M16 pattern rifles. This group includes the bolt carrier, bolt assembly, gas key, cam pin, and firing pin—everything needed to restore function to your rifle. Built to mil-spec dimensions, it ensures reliable cycling with standard upper receivers and compatible with both 5.56 NATO and .223 Remington chamberings.

Constructed from 8620 steel carrier with a Carpenter 158 steel bolt, the group features proper staking on the gas key and magnetic particle inspection (MPI) testing of the bolt. The carrier is phosphate-coated for corrosion resistance. This is a drop-in installation for anyone familiar with basic AR-15 disassembly and maintenance—no gunsmithing required.

• Part Type: Complete Bolt Carrier Group
• Compatible Firearms: AR-15, M16 (5.56 NATO / .223 Rem)
• Carrier Material: 8620 Steel
• Bolt Material: Carpenter 158 Steel (MPI Tested)
• Finish: Phosphate
• Gas Key: Properly Staked
• Installation: Drop-In
• Includes: Bolt Carrier, Bolt Assembly, Gas Key, Cam Pin, Firing Pin