Classic Arms Snake Eyes

This is a blackpowder muzzleloading handgun. I am an FFL holder so I want to make sure I abide by the law hahaha not that I wouldn't if I weren't a holder but you know what I'm getting...ATF staring me down a littler more. Does anyone know what states require shipping this to an FFL holder and which do not? I want to put it in my auction description so there's no confusion at checkout time. Thanks so much!