Shipping standard with a PROOF Research barrel, Ruger's newest AR-556 MPR aims to please when it comes to striking a balance between performance and weight. 

Besides its 1:8-twist 18-inch carbon-fiber wrapped barrel, the newest addition to the Ruger AR-556 MPR family is chambered in .223 Wylde, so it reliably functions with both .223 Remington and 5.56 NATO ammunition. Other features include the Ruger Elite 452 two-stage trigger with an advertised 4.5-pound break, a free-floated 15-inch hand guard with M-LOK accessory slots, and a muzzle brake over industry-standard 1/2x28 TPI threads so that it can be easily swapped out for suppressors or other devices. The furniture is all Magpul, including a PRS Lite stock and MOE-K2 grip.

But the real story is the weight, a svelte 7.4 pounds while keeping an 18-inch barrel with a rifle-length gas system, full-length Pic rail, and full handguard that allows accessories at the 3:00, 6:00, and 9:00 o'clock positions. 

The new Ruger AR-556 MPR PROOF
Sporting a gray Cerakote finish on its aerospace-grade 7075-T6 aluminum receivers, the newest Ruger AR-556 MPR is 37.63-39 inches overall in length, depending on the position of its Magpul PRS stock, which has length-of-pull and comb-height adjustments for the best fit. (Photo: Ruger) 
The new Ruger AR-556 MPR PROOF
The Ruger muzzle brake is a radial port design that the company contends "significantly reduces felt recoil and muzzle movement." The threaded barrel allows for standard 1/2x28 muzzle accessories to be installed. (Photo: Ruger) 
The new Ruger AR-556 MPR PROOF
On the inside, the bolt is mil-spec 9310 and is machined, shot peened, and proof tested for strength and durability while the bolt carrier and gas key have chrome-plated inside diameters. (Photo: Ruger) 

Price on the new Ruger AR-556 MPR PROOF is a very SIG-like $2,049, and the rifle ships with a single 30-round polymer magazine. By comparison, this is about twice the price of the standard mid-length gas system 5.56-chambered MPR with a 16.10-inch alloy barrel and a Bravo collapsible buttstock on a Mil-Spec buffer tube.

revolver barrel loading graphic