Does anyone know were I can get parts for a IAC or Norinco 372 copy of the Ithica 37? are any of the 37 parts interchangable? and are these shotguns any good? I have looked every were I could on the net and have not found any parts for this gun. I really like the gun and would like to find a pistol grip and a mag extension for it, I can live without the pistol grip but I definitely want the mag extension. Thanks for your time.