Guntec USA AR-15 Bolt Carrier Group BCG Mil-Spec Nickel Boron GT-BCG-NB. The Guntec USA BCG utilizes an oil key locking system that prevents any unintentional bolt body openings. This is the same type of locking system used on high stress components...
Guntec USA AR-15 Bolt Carrier Group BCG Mil-Spec Nickel Boron GT-BCG-NB. The Guntec USA BCG utilizes an oil key locking system that prevents any unintentional bolt body openings. This is the same type of locking system used on high stress components...