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 So What’s Next? Jim Cirillo’s 1-2-3-6 Drill Be More Than A Bodyguard Which Shotgun Safety Is Best? Grocery Stores Lining up for Ammo Vending Machines Review: Smith & Wesson Model 1854 Rifle