eat thank youMost old guns just had a hole drilled inthe barrel.
Some had a inner coning I’ve not tried but looks like a PIA to do.
Some had an outer coning.
Liners seem to have been rare, or placed when the original burned out. Top quality guns, sold to the rich might have gold or platinum liners by late eighteenth century.
When you say just a noise maker a single 1/16 hole will work well, but it does produce a little slowe fire then a lined gun.
I shot a gun for years without a liner and it worked well