2" long working revolver.
Yeah, even though it's theoretically lethal, on its own it's a novelty. The part that's potentially scary is the existence of 3mm ammo. You could build a sports watch that held two or three of these bullets and used electric "firing pins" to get a wrist-mounted weapon that might well get through security (you take off the "watch" and stick it in the security tray, then get it back after you're wanded through). Press and hold one of the buttons for 10 seconds to fire all the bullets at point blank range. Just make sure your hand is in the right position so you don't shoot yourself. ;)
Yeah, even though it's theoretically lethal, on its own it's a novelty. The part that's potentially scary is the existence of 3mm ammo. You could build a sports watch that held two or three of these bullets and used electric "firing pins" to get a wrist-mounted weapon that might well get through security (you take off the "watch" and stick it in the security tray, then get it back after you're wanded through). Press and hold one of the buttons for 10 seconds to fire all the bullets at point blank range. Just make sure your hand is in the right position so you don't shoot yourself. ;)
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