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 AR-15 Muzzle Brakes Gemtech Suppressed Bolt Carrier 14 New Rifle-Caliber Pistols for 2019 Most Popular 9/11 20 Years Later: A Special Smith & Wesson Personal Defense In Rural America Does It Fit Your Mitt? New Shotgun and Hybrid Suppressors for 2025 Tech Wisdom: The Physics of Recoil The Classics: The Bren Ten