HK MP5 Features You can get the authentic look feel and features of the legendary HK MP5 in a semi-automatic .22 LR pistol. HK has partnered with Umarex of Germany to bring you the only HK-authorized rimfire versions of the legendary MP5. So whether you re looking for an economic but serious sub-caliber trainer a suppressor host or just want the coolest .22 LR fun gun on the range look no further. HK MP5 Specifications Brand: HK Category: Tactical Pistols Caliber: 22 LR Model: MP5 Capacity: 10+1 Action: Semi-Auto OAL: 18.20 Hand: Right Sights: Adjustable Rear Gun Platform: MP5-Style Magazine Type: OEM Grips: Black Polymer Safety: Manual Thumb Barrel Length: 8.50 Max Capacity: 10 Trigger: Single-Stage Weight: 5.90 lbs Stock Finish: Black