Ruger® AR-556® MPR .450 Bushmaster

Lower receiver is fitted with Magpul® MOE® grip and MOE SL™ collapsible buttstock on the Mil-Spec buffer tube.

Handguard is free-floating for accuracy and the slim, 15″ length provides enhanced ergonomics and support.

Flattop upper receiver includes an enlarged window for easy ejection as well as forward assist, dust cover and brass deflector. CNC-machined from Mil-Spec forging and Type III hard coat anodized for maximum durability.

Bolt is machined from high-strength superalloy, more than 50% stronger than traditional MSR bolt materials, and engineered with tapered lugs to support the large case head of .450 Bushmaster ammunition.

The Ruger® Elite 452™ AR-Trigger is a two-stage trigger that offers a smooth, crisp, 4.5 pound trigger pull. It features a full-strength hammer spring for consistent primer ignition and a lightweight hammer that enables a 30% faster lock time over standard MSR triggers.

Carbine-length gas system provides the most reliable function with .450 Bushmaster ammunition.

Magpul® M-LOK® accessory attachment slots along the 3:00, 6:00 and 9:00 positions with additional slots on the angled faces near the muzzle.

Cold hammer-forged 4140 chrome-moly steel barrel with ultra-precise 5R rifling and black nitrided finish provides exceptional accuracy, longevity and easy cleaning. The 1:16″ twist rate maximizes accuracy with bullets ranging from 170 to 260 grains.

Chrome-plated bolt carrier inside diameter and chrome-plated gas key inside diameter provide exceptional resistance to hot gases. The gas key is staked so that it will not loosen after extensive firing.

Ruger® muzzle brake is a radial port design that significantly reduces felt recoil and muzzle movement. The 11/16″-24 threaded barrel allows for standard muzzle accessories to be installed.

Also includes: One, 5-round metal box magazine.