Bushmaster Bravo Zulu 450 Bushmaster 20" Upper Receiver, Black - 00-40009-BLK

This AR-15 upper receiver is chambered in 450 Bushmaster and features a 20" threaded barrel with a 1-in-24" twist rate and 11/16x24 thread pattern. The upper includes a salt bath nitride bolt carrier group, carbine length gas system, and a 14" free float M-LOK handguard, arriving fully assembled and optics-ready.