The Can Cannon Soda Can Launcher
Big & Rich recommend ladies save a horse, ride a cowboy, and the Can Cannon recommends cowboys save a bullet, fire a shook-up sodie can.
The Can Cannon attaches to your AR-15 / M16 rifle to provide hours of useless fun launching soda cans, or any other heavy, thin-walled object you've got in your lair. (A Can Cannon Instagram follower said he's used his to fire tennis balls too.) It contains a proprietary gas ported barrel and pressure tube, both to give projectiles an average range of 105 yards, and to reduce exposure to high pressure gases, which could "detonate" carbonated beverages too soon.
Maker X Products says the Can Cannon is 100% legal, and provides a link to their BATF approval letter on its listing page. The design is not considered a Destructive Device or firearm. (Note: The thing you attach your Can Cannon to still is.)
At printing, X Products was designing some accessories for the Can Cannon to launch, some of which might even make it a practical piece of equipment to own. Check out the second video in the gallery above to see a test run of the Grappling Hook attachment. Also in the works: a Net Launcher; Dog Training Toys for duck hunting and retrieval; a T-Shirt Launcher; Lawn Darts; and a Harpoon.