The RISE Armament RA-1010 Low-Mass Bolt Carrier Group is a lightweight, high performance BCG that is designed to help you shoot more accurately. The reduced reciprocating mass during the firing cycle lessens recoil and helps you stay on target. The complete BCG weighs in at just less than 8.9 oz, making it one of the lightest BCGs on the market. The black nitride finish enhances strength and reduces friction for improved performance. It's also available in nickel boron which reduces friction even further, improves overall performance and makes it easier to clean.