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Umarex, the parent company of Carl Walther, introduced a line of "HK Tactical .22 Long Rifle" rifles that are HK look-alike .22LR firearms. Here are a couple configurations:
They will have the following four HKs available: MP5 A5, MP5 SD (shown above), 416 D145RS, and 416 Pistol (shown above). They will also have a line of Colt ones: M4 Carbine, M4 OPS, M16 Rifle, and M16 SPR.