Guntec USA Bolt Carrier Group BCG Ar10 .308 Mil-spec Nitride GT-BCG-308. These Bolt Carrier Groups from Guntec USA have a properly-tightened and gas key staked properly so users don't need to worry about damaging their BCG's finish. For even further...
Guntec USA Bolt Carrier Group BCG Ar10 .308 Mil-spec Nitride GT-BCG-308. These Bolt Carrier Groups from Guntec USA have a properly-tightened and gas key staked properly so users don't need to worry about damaging their BCG's finish. For even further...