by Shooting Illustrated Staff posted on October 21, 2010 Guns Support NRA Shooting Illustrated DONATE Benelli MR1 In this article 5.56x45 mm, Benneli, semi-auto rifles Related Stories DPMS Panther 3G1 Gallery DPMS Sportical Gallery The Truth About Pistons Barrett REC7 Chambered in 5.56 NATO Gallery Auto-Ordnance AOM160 M1 CarbineAuto-Ordnance AOM160 M1 Carbine Gallery Most Popular Double Stack 1911s vs. Single Stack 1911s Round Up: Affordable Pistol Red-Dot Sights Don’t Overthink Your Shooting Round-Up: Rapid Access Safes for Long Guns I Carry: Ruger RXM 9mm Pistol in a Mission First Tactical Holster First Look: Franklin Armory AR-Essential Binary Trigger