The Zastava M91 is a semi-automatic designated marksman rifle chambered in 7.62x54R, based on the AK operating system with an extended barrel and scope rail. It was developed for the Yugoslav military as a squad-level sniper support weapon. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 7.62x54R Capacity: 10 Year introduced: 1991, Serbia Weight: 11.2 oz Overall length: 44.7" Status: Active Military use: Yes Intended use: Duty, Precision