The 450 Bushmaster was released in 2016 by Tim LeGendre of LeMag Firearms to achieve one-shot, one-kill for large game with an AR15. The straight wall cartridge is legal in states that prohibit hunting with bottleneck cartridges. The 450 Bushmaster delivers a 45 caliber projectile at a 2200 fps muzzle velocity, and the typical 250 grain, hollow-point (ballistic tip) round is highly lethal inside 250 yards. Standard AR15 magazines can be converted for use in a single stack configuration with a single stack follower, but 450 Bushmaster specific magazines are recommended for reliable operation. The upper receiver and bolt are both modified to accommodate the large bore 450 Bushmaster ammunition on the AR15 platform.

Any 450 Bushmaster Upper Receiver we sell can be configured to your specifications before adding it to the cart.  We offer matched muzzle devices, rails, bolt carrier groups, magazines, and charging handles to make your 450 Bushmaster Upper Assembly turn key and ready to shoot out of the box.

AR15Parts.com components are sourced from top US manufacturers including Aero Precision, Anderson Manufacturing, Ballistic Advantage, Shaw Barrels, Swan Machine, Wilson Arms, Wilson Combat, ZRO Delta, and others. Each upper assembly has options to select Rail, Muzzle Device, Bolt Carrier Group (BCG), Charging Handle, and Magazine. Additional parts are available individually on our website.

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