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 Heckler & Koch MR556A1 Bushmaster ACR Barrett REC7 in 5.56 NATO Most Popular Fightin’ Iron: The Hi Power Returns 14 Great Pocket Pistols for Personal Defense Top 5 'Budget-Priced' .50 BMG Rifles First Look: EAA MC 14 T Pistol by Girsan 10 Budget-Priced .22 Rifles Under $200 10mm vs. .40 S&W: Similarities, Differences and Uses