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if you're safety-conscious (good on you), i don't recommend messing around with stuff like this. with all the variance in materials, extrusion temperatures, printer types, etc., there's no way i can guarantee this thing won't become a frag grenade. that said, it has been test fired and it does work. there's a vid that i have yet to post. if you want guarantees, you are better off buying something from the store. this is the maker world, man! :D