AR-15 300 AAC BLACKOUT 16" stainless steel diamond fluted upper assembly, Left Hand. This is a perfect upgrade to your AR-15 Rifle. 300 blackout caliber uppers use your standard .223/5.56 bolt carrier groups and magazines! No special bolts or magazines to buy to get into a new caliber!
Upper assembly does not include BCG and Charging Handle. Can be purchased separately.