The Heckler &amp; Koch PSG-1 is a semi-automatic sniper rifle. It is made by the German gun company Heckler &amp; Koch. PSG-1 is a shortening of the German word "Präzisionsschützengewehr-1", or literally the "precision-shooting rifle". It fires the 7.62x51mm NATO bullet. It is a heavily changed version of the G3 rifle. The Munich massacre during the 1972 Summer Olympics showed the need for West German police and counter-terrorists to have a precision rifle, which West Germany did not have at the time.