Packing exceptional performance into a lightweight - but full-power - package, RISE Armament designed the RA-1010 Low-Mass Bolt Carrier Group 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 just under 8.9 ounces. Its black nitride finish enhances strength and reduces friction for better performance. It's also available in nickel boron, which reduces friction, improves overall performance, and makes it easier to clean.Features :Nickel Boron coatingPrecision manufacturedCompatible with lighter buffersAR15/M4Finish: Nickel Boron