Heckler & Koch HK416, Semi-Automatic, 22LR, AR-15, 16.1 Threaded Barrel, 1/2X28 Threads, Black, Synthetic Stock, Right Hand, M-LOK RIS Rail, Front/Rear Flip Sights, 20 Rounds, 1 Magazine 81000401 Get the look and feel of the legendary HK416 used by the world's most elite fighting forces in a semi-automatic .22 LR rifle. HK partnered with Umarex of Germany to bring you the best, most realistic HK branded rimfire rifles available. Whether you use it as sub-caliber trainer, for hunting or competition, make sure you get the only HK416 .22 LR rifle authorized by HK. Features include an aluminum receiver, rail interface system, collapsible buttstock, pistol grip with storage compartment, adjustable flip-up sights, last round bolt hold open functionality and a threaded muzzle.