It would have to display an uncanny level of reliability for anyone to actually consider equipping cops or soldiers with Metalstorm's designs, though. Consider what happens if a charge fails to fire. Not only that round, but all the rounds stacked underneath it, are useless.
Then there's Metalstorm's "Variable Lethality" handgun design. Like a Star Trek phaser, it has setting for "stun" and "kill". The shooter can either launch a beanbag round, or switch to conventional projectiles (and I could swear that I recall reading somewhere that the pistol actually *speaks* when switched to "Lethal" mode, as a warning to fleeing criminals, I suppose. "Danger, Will Robinson!!") Y'know, the camera analogy still holds true. There was a Minolta camera back in the '80s called the "Talker", which spat out instructions in a female voice (with a heavy Japanese accent): "Too dark! Use frash!"
Metalstorm just keeps popping up every year or so, without much (if any) new information added. Things that make you go: "Hmmmm..."
PDF required.