The AR-STONER T-Series Bolt Carrier Group is a great option for your next 7.62x39mm AR build. Machined to strict mil-spec tolerances, this bolt carrier group is drop-in ready. The Nitride finish provides enhanced reliability and is more resistant to wear. With a 7.62x39 Winchester bolt face, this Bolt Carrier Group is ideal for your next rifle.Note: Upon installation, headspace should be verified by a qualified gunsmith. Features8620 Steel Carrier9310 Steel Bolt HPT/MPIQPQ Nitride TreatedMagnetic Particle InspectedShot PeenedSerrated for use with Forward AssistNitride Treated Gas Key and ExtractorStaked Gas Key