The Heckler & Koch MP7 SD 4.5mm represents a combination of tactical assault rifle, submachine gun and pistol design, while being a classic break barrel spring air rifle in an unconventional coat.
The weapon is equipped with a rifled steel barrel with a length of 163 mm and a retractable metal stock. The MP7 has several 22mm rails that can be used for sighting mechanisms (sights, rifle scopes, lasers) and tactical aids such as a battery.
The energy is up to 7.5 J and maximum muzzle velocity up to 141 m/s. A simple push safety is located on the rifle body to prevent accidental discharge. Underneath is the Single Action Trigger, which is activated when the gun is cocked. Overall length without the extended stock is 574mm, with fully the extended stock it measures 695mm.
The air rifle's mechanism is concealed in a polymer jacket and the barrel is finished with a fake silencer, which serves as an aid to make the weapon easier to cock. The simple pistol grip accentuates the tactical feel and functionality.