To the tune of the Red Dwarf theme:

It's cold outside / there's no kind of atmosphere / I want to shoot / revolver / there's a kit / and it comes from France / fun, fun, fun / in the barn, barn barn!

Yes indeed, H&C Collection make a kit for indoor training with black powder muzzleloading percussion revolvers. Rubber projectiles, 6mm Flobert blanks to drive them. Hours of harmless indoor fun!

Sorry, no linkies - Google is your friend and we don't want to get into trouble with the bots again :)