A guy I know from work was thinning out his toys and I bought his 37mm grenade/flare launcher! Just when I thought this rifle could not possibly get any heavier I find yet another attachment to get it closer to boat anchor weight!
This is the 37mm version, not the 40mm version. This one can be used with excellent flares, smoke grenades and a selection of gas grenades. I was talking to a friend that is a Class III dealer and he says that real grenades can be purchased but they are VERY expensive and require the $200 tax stamp for each one.
It also has adapters so it can use 26.5mm rounds as well as 12ga shotgun rounds. They make 12ga flares but don't use 12ga shotgun rounds unless you register the device as a short shotgun AOW with the ATF. I might do that for the hell of it because it's only $5.
--I have flares. Should be fun on July 4th!