Spikes Tactical Nickel Boron Bolt Carrier Group HPT/MPI M16 BCG (5.56)

Features

• 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