For a silencer to be considered a silencer it has to: Make the gun or attempt to make the weapon quieter. Be portable Be part of a firearm that fires fixed ammunition or be able to be attached to such a weapon. If the silencer is permanently attached to a muzzel loader or air rifle it's not regulated since it's part of a weapon that does not fire fixed ammunition. Or say some one uses a sandwich of tires roped together with plywood doughnuts in between the tires and on the ends to shoot chronograph BFG rounds with out bothering the neighbor too much. This tire stack silencer would not be regulated because it is not portable and does not become part of the weapon. Putting a plastic bottle buy it's self on the end of a 22 pistol would be regulated, it probably wouldn't have reduce the noise at all but it becomes part of the weapon and is an attempt to make it quieter. Just buy a god damned silencer, pay the tax and be done with it.
Diablo shotgun pistol. 285fps. Tips: Use actual blackpowder. If you can't get bp use granulated bp substitute not the pellets. Large bore muzzle loaders preform far better with real bp. Use 209 muzzle loader primers not standard 209 shotgun primers. Get the 9 inch one.
It goes against every fiber of my being to spend money for something I don't need or can make myself, and to pay taxes of any type!
And that's the problem with black powder weapons, you can't leave them loaded because nature is not stable. I read once, that Wild Bill Hickock fired his guns every morning while having his coffee. He would fire one revolver, disassembled/cleaned/inspected and reloaded it, and then repeated the process with the other. That way he got some target practice, had fresh loads in his guns, and always had a least one loaded weapon at hand.
Everyone who does makes them "more common use". The threshold for common use I believe is 200,000. We're way past that, well on our way to them being an everyday item.
