This drop-in A3 upper will mount to virtually any standard AR-15 mil-spec lower receiver. With a velocity of 2200 FPS, the Hornady 250 Grain SST/FT bullet in the .450 Bushmaster “Thumper” is ideal for all large North American game. Though not a long distance cartridge, accuracy for the .450 Bushmaster has proved to be exceptional out to 200 yards with felt recoil similar to a 20 gauge shotgun. This AR-15 upper receiver features a tubular aluminum forends allow the barrel to free float from the nut forward, and chrome lining in both bore and chamber makes for long barrel life and easy cleaning.
This complete AR-15 upper receiver assembly comes complete with a charging handle, forward assist, ejection port cover, bolt and bolt carrier assembly. The complete upper also features a versatile flat top for mounting optical devices or accessories, making for an excellent hunting rifle.
– Upper Receiver Type: A3 Flat-Top
– Barrel Length: 20″
– Barrel Material: Chrome Moly Steel
– Muzzle Thread Pattern: 11/16″-24
– Chrome Lined: Yes
– Barrel Finish: Black Matte
– Barrel Twist Rate: 1 in 24″
– Chamber: 450 Bushmaster
– Muzzle Device: Izzy Muzzle Brake
– Gas System Length: Rifle
– Handguard: Free Float
– Sights: None
– Bolt Carrier Assembly Included: Yes