Spikes Tactical Nickel Boron Bolt Carrier Group HPT/MPI M16 BCG (5.56)
- Machined from 8620 Tool Steel (Carrier) and 158 Carpenter Steel (Bolt)
- Shrouded firing pin.
- Nickel Boron Coating inside and out (Bolt, Carrier, and Gas Key)
- Forged Mil-Spec gas key attached with Grade 8 hardware and Properly staked.
- Bolt is shot Peened and HPT/MPI
- Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring
- Tool Steel Extractor