by Shooting Illustrated Staff posted on October 13, 2011 Guns Support NRA Shooting Illustrated DONATE ** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. ** Primary Weapons Systems goes out of the box in AR design. In this article 5.56 NATO, 7.62 NATO, AR, Primary Weapons Systems Related Stories Primary Weapons Systems PWS MK116 and PWS MK216 Carbon-Fiber Rifle Round-Up Gemtech Suppressed Bolt Carrier AR-15 Muzzle Brakes 14 New Rifle-Caliber Pistols for 2019 Most Popular First Look: Glock Gen6 Pistols Top 5 'Budget-Priced' .50 BMG Rifles The Classics: Winchester Model 1907 I Carry: Smith & Wesson Bodyguard 2.0 Pistol in a PHLster Holster U.S. Army Purchasing Additional Mossberg 590A1 Pump-Action Shotguns Comfortable and Reliable Revolver Carry