Ruger AR-556 MPR 450 Bushmaster - 18" Barrel - Black - 5 Round

Current Stock:
  • 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.
  • 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 heavy barrel profile and 1:16" twist rate maximizes accuracy with bullets ranging from 170 to 260 grains.
  • 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.
  • 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.
  • 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.
  • Also includes: One, 5-round metal box magazine.


Stock Black Synthetic, Collapsible
Handguard Free-Float M-LOK®
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

Barrel Length:
Caliber Or Gauge:
450 Bushmaster
Made in USA
Threaded Barrel
Gas System:
Carbine Length
Magazine Capacity:
0 to 10
Rail System:
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