If you want airsoft grenades, get yourself Deep Fire Mk. IIs or M26s. They are basically a gas chamber, a three-piece shell, a spoon, and a pin. You pull pin, spoon pops out. After the mechanical fuse runs out, the gas chamber pops open, splitting open the three-piece shell, and sending it (and any bbs you put in there) flying every which way. Really fun stuff. Most of the stuff like that has been in use since before Deep Fire came out with their grenades early in 2007. Since you're in the US, I would advise the Deep Fire route, and I would not advise the home-mades. A lot of them are pyrotech
