The SP5 is the civilian-legal semi-automatic pistol version of the MP5 for the US market, built on the original German production line with the full HK roller-delayed blowback action. The 8.86-inch barrel provides MP5 ballistics in a pistol configuration that does not require an NFA tax stamp as a pistol. One of the most sought-after HK civilian products. Type: Semi-Auto Pistol Action: Roller-Delayed Blowback Caliber: 9mm Capacity: 10 Year introduced: 2018, Germany Weight: 5.6 oz Overall length: 13.9" Status: Active Intended use: Sport Shooting, Collector, Range