United Defense AR-15 5.56/.223
Complete Bolt Carrier Group
Limited Time Special Offer
The Bolt Carrier Group (BCG) is the heart of your AR-15. This United Defense BCG is made of 9310 steel then Nitride finished at the world class facility H&M then MPI and HPT inspected for extreme safety to ensure your AR-15 will run reliably as long as you have ammo to shoot it with. This is one of the highest quality BCGs made.
Extreme Metal hardness 85-90 Rockwell