This is a Spike's Tactical Bolt Carrier Group known as the M16, model ST5BG01.
Your Bolt Carrier Group is one of the most critical parts of your build. Don't buy an imitation. This is the same BCG Spike's Tactical uses in their factory built rifles.
Features:
Phosphate Coating Inside and Out
Laser Engraved with ST Spider Logo
Mil-Spec Bolt
