Well I never know what is comming next, up for grabs is your choice for a AR15 or AR10  can cannon, what can you do with this well acording to the maker quite a lot here are some ideas ( I can not print a few of my own LOL), Designed to launch soda cans and similarly sized projectiles including tennis balls, whipping cream, shaving cream, paint cans, t-shirts, and X Products approved accessories: Grappling Hook, Launcher Cups, Balls, and Spear Fishing Accessory. 

Yes you can buy them direct from their website but not at my prices which includes  the AR upper as well as the Blanks to fire the item of your choice.

The price for the AR15 upper with 50rd of blanks $280 obo

For the AR10 upper with 50 rds of blanks #$300 obo