ATI ATI15MS450BM Mil-Sport Upper 450 Bushmaster 16" Black Nitride Barrel, Aluminum Black Anodized Receiver, 15" KeyMod Rail Handguard for AR-15

American Tactical .450 Bushmaster Complete AR-15 Upper is drop in ready, upper receiver assembly features a forged aluminum Mil-Sport AR-15 pattern upper receiver with a 16" barrel with 1:24 button cut rifling and black nitride finish chambered for .450 Bushmaster. Completed with a 15" aluminum free floated key-mod rail system over a carbine length low profile DGIS gas system, A2 style compensator and black nitride finished bolt carrier group. Fits to any AR-15 pattern lower receiver. 100% Made in the USA and Assembled in Summerville, SC.