Heckler and Koch 81000404: Get the look and feel of the legendary HK416 used by the worlds most elite fighting forces in a semi-automatic .22 LR pistol. HK partnered with Umarex of Germany to bring you the best, most realistic HK rimfire available. Whether you use it as sub-caliber trainer, for hunting or competition make sure you get the only HK416 .22 LR pistol authorized by HK. Features-Rail Interface System M-LOK/ Mil STD. 1913, pistol grip with storage compartment, functional dust cover and last round bolt hold open. Compatible with most AR-style arm braces.