Ruger AR-556 MPR Rifle Now in .450 Bushmaster

by
posted on September 26, 2018
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
ruger_556_8522-1.jpg

Ruger has announced the new AR-556 Multi-Purpose Rifle (MPR) chambered in .450 Bushmaster, offering an ideal hunting platform for midwestern whitetail deer, sizeable pigs, and target shooting at heavy steel.



The MPR platform’s superior accuracy, versatility and shootability can be attributed to many features, including a Ruger muzzle brake, Elite 452 two-stage trigger, free-float handguard with Magpul M-LOK accessory attachment slots and Magpul furniture.

Accuracy and velocity are maximized with a nitrided, 18-5/8” cold-hammer-forged barrel and the 11/16”-24 radial port muzzle brake to soften recoil. A carbine-length gas system with 0.875” gas block ensures reliable function and fits under the 15” free-float handguard. The Magpul M-LOK accessory attachment slots around the handguard make attaching a sling and bipod easy. The handguard’s smooth profile situates easily on shooting sticks or a backpack for a steady shot.


Engineered with a high-strength superalloy bolt and tapered lug geometry, the .450 Bushmaster MPR is built to withstand the strength of a cartridge that delivers twice the energy of 5.56 NATO. The upper receiver features a large window for easy ejection and is covered by a standard dust cover. Mil-Spec forgings are CNC-machined, anodized and finished with Ruger’s Elite 452 two-stage trigger, Magpul MOE grip and MOE SL stock.

The rifle ships with a 5-round metal box magazine.


For more information on the AR-556 MPR or to learn more about the extensive line of award-winning Ruger firearms, visit Ruger.com  To find accessories for the AR-556 MPR and other Ruger firearms, visit ShopRuger.com or your local independent retailer of Ruger firearms.

Additional Reading:
The Keefe Report: Ruger's Multi-Purpose Rifle   

Latest

Trend Monitoring
Trend Monitoring

4 Helpful Online Tools to Track Ammunition Prices

For those seeking the best possible prices on ammunition, a number of new tools have emerged to give firearm enthusiasts an edge up when it comes to feeding their guns on a budget.

Book Review: 2026 Traveler’s Guide to the Firearm Laws of the Fifty States

Newly updated for 2026, the 30th edition of the “Traveler’s Guide to the Firearm Laws of the Fifty States” is a must-have resource for those who travel often and therefore must navigate the patchwork maze of laws imposed in various localities.

5 Must-Have Ruger Mini-14 Accessories

In production since 1973, the Ruger Mini-14 has spawned a rather healthy aftermarket of parts and accessories. Here are five that you really can't live without if you're a true Mini-14 fan.

New For 2026: U.S. Palm Eye of the Storm (EOS) Suppressors

Earlier this year, U.S. Palm promised to offer its own line of firearms and suppressors. Now, its line of suppressors, the Eye of the Storm (EOS) series, is finally here.

Gun of the Week: Taylor's & Co. TC73

The Taylor's Firearms TC73 has classic lines and a classic appearance, but unlike other lever-actions, this one has a few unique features.

The Armed Citizen® June 26, 2026

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

Interests



Get the best of American Rifleman delivered to your inbox.