The Lewis Machine and Tool AR-15 bolt carrier is the perfect addition to your next “bomb-proof” ar-15 build. This full auto rated, M16 cut carrier is designed for long term durability and reliability. The hard chromed carrier is machined out of 8620 Carpenter steel and has been magnetic particle inspect to ensure the dimensions are Mil-Spec or greater. The gas key has been optimized for LMT’s short stroke gas piston system and the heavier weight of the M16 profile helps to prevent bolt bounce during rapid fire. Get the peace of mind that comes with knowing your AR-15 is built with only the highest quality parts – order your LMT 5.56 bolt carrier today!