I've read different posts where it is sometimes mentioned that some states consider any muzzleloading handgun or long gun a firearm. Do residents of those states have to have a serial number stamped on the barrel? I know repros from the large manufactures come with one to satisfy import laws but how about custom made guns with no serial numbers heading to these restricted states? I live in a state where no BS laws like that apply but who knows what the future holds in store for us all.