Are there civilian-legal (w/o reg) barrel launched smoke "grenades?" For the hell of it I've been looking at under-barrel 37mm flare and smoke launchers and wondered if there were legal, no registration smoke and flare barrel launched rifle "grenades?" Seems a hell of a lot cheaper than spending $300 for a neat looking otherwise useless AR toy. Ps- I have no interest in launching golf balls or soda cans lol