The MP5 submachine gun is easily the most famous of all HK gun designs. In fact, the sleek lines of the MP5 may be the most recognizable gun silhouette of all, regardless of manufacturer. You can get the authentic look, feel and features of the legendary HK MP5 in a semi-automatic .22 LR rifle. HK has partnered with Umarex of Germany to bring you the only HK-authorized rimfire versions of the legendary MP5.