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 Straight Talk: Know Your Gun Top 5 'Budget-Priced' .50 BMG Rifles Handguns: Carry Rotation Downside 10 Budget-Priced .22 Rifles Under $200 Greatest Defensive Semi-Automatic Shotguns First Look: Smith & Wesson Model 1854 Lever-Action Rifle in 360 Buckhammer