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Bushmaster .450 Bushmaster Upper Assembly w/5-Round Magazine has been discontinued by Bushmaster and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, Magazines, AR 15 Parts, Rifle Parts, Rifle Magazines, AR15 Upper Receivers, AR Rifle Magazines yourself to try and find the perfect replacement for you!
Certain firearm magazines and extensions are subject to maximum capacity restrictions based on state and local laws. Currently, we are unable to sell these products to some locations. For a complete list of these restrictions, please visit our policy page.
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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 designed for all large North American game. Though not a long distance cartridge accuracy has proved to be exceptional out to 200 yards with felt recoil similar to a 20 gauge shotgun. The tubular aluminum forend allows 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 upper receiver assembly comes complete with a charging handle forward assist ejection port cover bolt and bolt carrier assembly. The upper also features a versatile flat top for mounting optical devices or accessories. Includes a 5 round magazine.