Rise Armament RA1010NIB Low-Mass Bolt Carrier Group 5.56x45mm NATO Nickel Boron Steel for AR-15

Packing exceptional performance in a lightweight but full-power package RISE Armament designed the RA-1010 Low-Mass Bolt Carrier Group (BCG) to help you shoot more accurately. With a reduced reciprocating mass during the firing cycle, it lessens recoil and helps you stay on target. The complete BCG weighs in at just less than 8.9 ounces.