I need to find the law on Stage or Prop, Blank Firing Guns. I have seen them for sale but they use an odd blank round. I wanna weld a plug into a shot out Yugo barrel just after the has port with a hole for the gas to escape may not even have to drill a hole in it enough gas may escape from the groves in the Rifling. So it can fire blanks only.. but be full auto!! I would Also weld the barrel to the trunnion so it cannot be easily converted back to a functioning rifle. As for not being able to chamber a live round well can cut the barrel and change the chamber to allow only 7.62X39 blanks or Drill a hole and weld a pin in the chamber so it would not be able to be chambered with a live round.. Seen some discussion online but no real BATF interpretations. I know i could write the BATF but would rather find an interpretation that already exists.