Spikes Tactical BCG 5.56 M16 w/HPT/MPI Bolt Lightweight - Nickel Boron Finish ST5BG05. These Bolt Carrier Groups by Spikes Tactical have shot peened bolts that are CNC machined from 158 carpenter steel and a mil-spec tool steel carrier key that is...
Spikes Tactical BCG 5.56 M16 w/HPT/MPI Bolt Lightweight - Nickel Boron Finish ST5BG05. These Bolt Carrier Groups by Spikes Tactical have shot peened bolts that are CNC machined from 158 carpenter steel and a mil-spec tool steel carrier key that is...