Rise Armament RA1011NIB Bolt Carrier Group 5.56x45mm NATO Nickel Boron 4140 Steel

The Rise Armament RA1011NIB is a precision-machined bolt carrier group designed for AR-15-pattern rifles chambered in 5.56x45mm NATO and also rated for .223 Remington. Rise Armament manufactures each carrier with precision and individually inspects it to ensure consistent, high-level performance. The unit is machined from 4140 steel and finished in Nickel Boron.