There is a small niche of hobbyists that enjoy the 37mm flare launchers for launching pyrotechnics, smoke grenades, paint cartridges, etc. Some even paper them as a destructive device (DD) so that they can run buckshot and other loads through them. Anyway, I've never taken the plunge, as I don't know if it would be all that fun. Anyone running 37mm guns? What was fun? What is not so much? Thanks.