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.