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The Zastava M59/66 PAP is a Yugoslavian licensed derivative of the Soviet SKS semi-automatic rifle. In Yugoslavia, it received the popular nickname "papovka" derived from PAP, the abbreviation for poluautomatska puška, or Serb for "semi-automatic rifle". The M59/66 functions identically to the SKS, but has a permanently attached grenade launcher spigot that also serves as a muzzle brake. The weapon was also produced with a folding grenade launcher sight which is normally folded flat behind the front sight.