Ruger AR-556 MPR 450 Bushmaster 18.63″ Barrel 5+1 08522


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Ruger AR-556 MPR Semi-Auto Rifle in 450 Bushmaster


  • Lower receiver is fitted with Magpul® MOE® grip and MOE SL® collapsible buttstock on a Mil-Spec buffer tube.
  • Handguard is free-floated for accuracy and the slim, 15″ length provides enhanced ergonomics. 
  • To support the large case head of .450 Bushmaster ammunition, the .450 Bushmaster bolt is engineered with tapered lugs and machined from a high-strength superalloy.
  • 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 faster lock time for improved accuracy.
  • 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.
  • Ruger® muzzle brake is a radial port design that significantly reduces felt recoil and muzzle movement. The threaded barrel allows for standard muzzle accessories to be installed.
  • 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 heavy barrel profile and 1:16″ twist rate maximizes accuracy with bullets ranging from 170 to 260 grains.
  • Made from aerospace-grade 7075-T6 aluminum forging, the flat top upper receiver includes a forward assist, dust cover and brass deflector, and is Type III hard-coat anodized for maximum durability.
  • Bolt carrier and gas key have chrome-plated inside diameters to provide exceptional resistance to hot gases. The gas key is staked so that it will not loosen after extensive firing.
  • Carbine-length gas system provides the most reliable function with .450 Bushmaster ammunition.
  • Also includes: one, 5-round metal magazine.


Manufacturuer/ Model: Ruger AR-556 MPR

Stock: Synthetic, Collapsible

Handguard: Free-Float With Magpul® M-LOK® Slots

Sights: None

Barrel Length: 18.63″

Thread Pattern: 11/16″-24 Twist: 1:16″ RH

Capacity: 5

Finish: Type III Hard-Coat Anodized Height: 7.30″

Weight: 7.4 lb.

Overall Length: 35.60″ – 38.90″

Length of Pull: 11.10″ – 14.40″

Grooves: 5

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