ENHANCED FULL AUTO 5.56MM BOLT CARRIER GROUP If LMT's standard bolt carrier group is the infantryman of the gun industry, then their enhanced BCG is the delta operator. This carrier group was designed to function effectively in full-auto, suppressed, and short barrel weapon systems, and it is made of materials far more durable than your standard fare. Quite simply, it's the best possible upgrade for your rifle to increase reliability and functionality. Behold the laundry list of enhancements their design brings to the table: Carrier: Altered cam path for longer dwell time and more robust extraction Modified gas hole improves gas flow across the bolt's tail Addit Mfg: Lmt Defense