The matador was made by AYA, who are alive and well. That semi schnable fore end looks Russian all right, Baikal still uses those.
It looks like all you need is one firing pin and two set screws. The screws are probably metric. Take the receiver and go to a hardware store or Fastenal and determine the screw size and pitch, and if they don't have them you can get them from McMaster-Carr. Any competent gunsmith OR machinist should be able to turn out a firing pin in short order. OR, find someone who speaks Russian to interpret everything, but even if you find the makers odds on parts are long. That doesn't look like a new gun.