The MP5 is no more than the scaled-down version of the Heckler-Koch G3 battle rifle. It shares the same basic design with stamped steel receiver and the same roller-delayed blowback action. The MP5 is always fired from closed bolt for improved accuracy, but this limits the amount of sustained fire due to the barrel overheating and resulting cook-off problems. To avoid this, MP5 cocking handle could be locked in the rear position in the special slot, leaving the bolt in the open position, with no cartridge in the chamber. To commence the fire one must simply release the cocking handle from its notch and then pull the trigger. Sights are similar to other HK models, and consists of the front hooded post sight and the adjustable for windage and elevation drum-type diopter rear sight. Special quick-detachable clamp mounts allows for installation of night, optical and red-dot sights if required.

The preferred submachine gun of counter-terrorist operatives around the world, the Heckler & Koch's MP5 range is known for its reliability and accuracy, even when firing on full automatic. DUTA uses the 9mm MP5A4 which includes single, 3 round burst and full automatic firing and the fixed stock. The A5 uses a retractable stock and A1-A3 versions use the Navy trigger group which does not have the 3 round burst.