The AR-STONER Lightweight Bolt Carrier Group is a great option for your next AR-Stoner build. This BCG is machined to strict standards. At 9.1 ounces, this is 20% lighter than standard bolt carrier groups. The Nitride finish is slick and will function flawlessly. Featuring a staked gas key, the AR-STONER Lightweight Bolt Carrier Group is drop-in ready.Note: Upon installation, headspace should be verified by a qualified gunsmith.Features:.223 Remington bolt raceProperly staked gas keyDrop-In readyNitride finish20% lighter than standard bolt carrier groups.