Elite Force Heckler & Koch USP Compact Gas Blowback Airsoft Pistol – Black. The HK USP Compact is a Gas Blowback airsoft pistol with double action. This authentic HK replica has a moving hammer that adds realism. It has fixed tactical sights and a velocity of 300 FPS! Fully licensed H&K trademarks and serial plate. Ambidextrous slide catch and mag release. Fixed tactical bright white-dot sights. Integraded USP accessory rail.