My sample came with a Magpul Gen2 PMag.īoth stock and grip provide good looks and functionality without adding any extra weight. The standard MPR model ships with a 30-round magazine-except to restrictive states, where the rifle comes with a 10-rounder. The oversize polymer handguard is a Ruger-made product. Ruger designed its own pistol grip for the original AR-556, but to better match the Magpul SL (Slim Line) stock, the company went with the Magpul SL pistol grip as well. M-Lok is a slot-based mounting system designed by Magpul, the kings of AR accessories, so it isn’t a big surprise to see other Magpul products on this rifle. It’s 1.5 inches wide and two inches tall measured from the top of the rail. The barrel free-floats inside a 15-inch aluminum handguard with M-Lok accessory attachment slots at three, six and nine o’clock, as well as some additional angled slots near the muzzle that work great for mounting lights. While loud, the 30-port brake does a great job of taming recoil. The 15-inch M-Lok handguard provides a lot of real estate for mounting accessories or placing your support hand. The bolt is machined from 9310 alloy steel, shot-peened and pressure tested. ammo as well as the slightly hotter 5.56 NATO military loads. This barrel also features a 5.56 NATO chamber, which means it will safely handle both commercial. While they were specifically designed to aid in reliability when shooting full-auto, they sure don’t hurt anything when chugging along in simple semiauto. A light barrel, on the other hand, is light all the time. However, in any defensive situation outside of Afghanistan, if you’re firing fast enough to get your barrel so hot your point of impact actually shifts, the bad guys are going to be close enough that the point of impact shift won’t be nearly enough to take you off target. Sure, thicker barrels take longer to get hot and hold their zero better when they get hot. I am not one of those people who worships at the altar of thick barrels on fighting rifles, and since “multi-purpose” is right in the name of the MPR, it qualifies. One of the biggest improvements over the original AR-556 is the addition of the firm’s Elite 452 trigger. The guns are being built at Ruger’s relatively new North Carolina facility. With the stock fully extended, the balance point on the AR-556 MPR is right under the front takedown pin, which is excellent for an 18-inch-barreled rifle. Forward of the handguard the barrel has a 0.70-inch diameter. For the first six inches or so it has a heavy profile, then it narrows. The barrel is cold-hammer-forged 4140 chrome-moly steel with a nitride finish for corrosion resistance. It features five-groove (5R) rifling, which is generally thought to provide increased accuracy over older rifling types. The original AR-556 featured this same twist rate, which was one of the reasons why the rifle was, and is, such a good deal. The 1:8 is believed by many to be the best twist rate for an AR barrel because it will handle bullets from 35 grains to 77 grains-every bullet weight that fits into a. The MPR’s 18-inch barrel has a 1:8 twist. The AR-556 has a 16-inch barrel with a fixed front sight and a round polymer handguard, while the new MPR sports an 18-inch barrel inside a free-float aluminum handguard. The two most easily spotted differences between the original AR-556 and the MPR are barrel length and the handguard. The original AR-556 is a capable rifle in its own right, but the differences between these two rifles add up to substantially different packages. It’s the MPR, which stands for Multi-Purpose Rifle.įrom the name it’s clear Ruger intends this rifle to be a do-it-all AR. It took the company a few years, but Ruger has finally introduced a second version of its AR-556. It offers everything you need in a well-made reliable package with a few unique Ruger touches-for a low price. In a short time the Ruger AR-556 has become the direct-gas-impingement M4-style AR-15 rifle of choice for many people.
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