Spikes Tactical M16/AR15 Bolt Carrier Group Nickel Boron 5.56 / .223 Rem / .300 AAC Blackout

Spike s Tactical Nickel Boron Bolt Carrier Group Features: The Spike s Tactical Bolt Carrier Group features the same MILSPEC finish as their standard BCG but features the superior Nickel Boron finish. Nickel Boron is a more durable finish and is easier to clean eliminates friction and can run lube free for thousands of rounds. Additionaly the Nickel Boron BCG is High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI) for high quality. Spike s Tacitcal Nickel Boron BCG Specifications: Brand: Spike s Tactical Construction: 8620 Tool Steel (Carrier) and 158 Carpenter Steel (Bolt) Caliber: .223 REM/5.56 NATO/.300 AAC BLACKOUT Type: Shrouded firing pin Finish: Nickel Boron Coating inside and out (Bolt Carrier and Gas Key) Gas Key: Forged Mil-Spec attached with Grade 8 hardware and Properly staked Testing: Bolt is shot Peened and HPT/MPI Additional Features: Mil-Spec Extractor Spring black extractor insert Viton O-Ring Additional Features: Tool Steel Extractor