Do you want a custom LEGO weapon that is going to blow your mind?? (Figuratively, of course.) The Frag Grenade is the weapon you are looking for. Pull the pin, toss, and wait for the big BOOM. 

It's very important you don't forget the "toss" step in this process though. Without the toss there will be a loss..........of your minifig's head. (These dudes below forgot the "toss" step.) 

Complete your criminal mastermind minifig with this week's custom LEGO gun highlight: the Gangster SMG.