If I made a black powder muzzleloader with a ported barrel, and I permanently welded one end cap at the muzzle end past the ports, and welded the other end cap close to the fore end, and made the can body such that it was captured between both end caps but could come apart for cleaning (while still captured), would the resulting integral silencer require a stamp as it was captured on a non firearm?
I know there was a bp rifle with a silencer permanent attached a few years ago, and no stamp was needed, but I don't think the silencer broke down for cleaning.