New current production Colt AR-15 / M16 carrier kit. These kits come with a carrier with factory staked gas key, select fire firing pin, cam pin, and retainer. Guaranteed to have C marked carrier. These kits are from complete Colt bolt carrier groups which have the bolt removed for buyers who just want the carrier and related parts. These are select fire carrier kits. This is the same carrier and related parts which come in all current Colt rifles, both semi auto only and select fire rifles.