The HK SP5 for sale is an authentic civilian sporting version of the legendary MP5 machine gun. Holding 30 rounds of 9mm ammo, the HK SP5 pistol is sized for dynamic shooting in close quarters with an overall length of 13.9-inches. Features on the H&K SP5 include a roller-delayed blowback operating system, an onboard elastic “bungee” sling, which facilitates stability and reduces fatigue, a 4.53-inch long Navy barrel with threaded tri-lug adaptor, a paddle magazine release, fluted chamber, and chrome-lined bore.