Original Trigger Pack Disconnector Lever with Spring and Stud. This prevents the sear from dropping when the charging handle is in the rear position
These have the rear trip tabs ground off so the trigger movement is not blocked if the charging handle is out of position. The front tab that interacts with teh tripping lever on the trigger is present and functional. Given the origin of these parts, they appear to have been modified by either the Germans or Yugoslavs.