Heckler & Koch MP7 SD 4.5 mm represents a combination of the tactical design of an assault rifle, submachine gun and pistol, while in fact being a classic break-barrel spring-powered air rifle in an unconventional guise.
The gun is fitted with a rifled steel barrel with a length of 163 mm and an extendable metal stock with a polymer buttpad. The MP7 has several 22 mm rails that can be used for aiming devices (sights, scopes, lasers) and tactical accessories, such as flashlights.
Muzzle energy is around 7.5 J and the maximum velocity up to 141 m/s. A simple manual push safety is located on the rifle body to prevent accidental discharge. Below it is a Single Action trigger, which is activated after cocking the gun.
The air rifle mechanism is hidden in a polymer housing and the barrel is finished with a dummy suppressor, which serves as an aid for easier cocking of the gun. A simple pistol grip underlines the tactical feel and functionality. The overall length without the stock extended is 574 mm, with the stock fully extended it measures 695 mm.