This is a Spike's Tactical Part known as the M16, model ST5BG05.
Your Bolt Carrier Group is one of the most critical parts of your build. Don't buy an imitation. This is the Spike's Tactical Lightweight BCG with Nickel Boron Coating.
Features:
Nickel Boron Coating Inside and Out (Bolt, Carrier, and Gas Key)
Laser Engraved with ST Spider Logo
Lightweight
