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 Want To Improve Your Accuracy? Get a Grip. Shotgun Limitations Roundup: .22LR Semi-Automatic Pistols Shell Shock Technologies Introduces Consumer Line The Thinking Man’s Defensive Gun Low Round Count Pistol Drills