Yugo Zavasta M 59/66 sks riffle. This is a used riffle with minor wear. It has a grenade modification. Lisenced version of the Soviet Sks semi automatic riffle. The riffle has been fitted with a folding latter sight for use in launching grenades. The sight is normally locked into a folding position atop the gas block. This action also closes off the gas port in the barel, which prevents the semi-automatic action from being cycled while a grenade is being launched. The M 59/66 was fitted with a bayonette mount which also doubled as a mount for the front sight and folding grenade launcher sight.