by Shooting Illustrated Staff posted on February 23, 2012 Guns Support NRA Shooting Illustrated DONATE Heckler & Koch's MR556A1 is a version of the terrorist-quashing HK416 that you can own. In this article 5.56 NATO, bin Laden, Heckler & Koch, HK416, SEALs, semi-auto rifles, Heckler & Koch MR556A1 Related Stories Heckler & Koch MR556A1 Stag Arms Model 3 Bushmaster ACR Barrett REC7 in 5.56 NATO Wilson Combat SPR Most Popular Tech Wisdom: .300 Ka-Boom Marines Ditch 100-Year-Old Marksmanship Standards Affordable Firepower: Five Budget-Friendly AR-15s Review: Springfield Armory 1911 TRP 4.25-inch CC Getting Serious: Stepping Up Your Marksmanship Skills Make It Work For You