Has anyone built one of these, or thought about it?
The shoot-the-star at the carnival type. These were made by Feltman, and the receiver drawings are out on the patent website. It works, but I think it would be fun to design something a little simpler.
There are tons of PVC "vortex" guns out there, but those are very crude. I actually built one, but it was not efficient or reliable. Sure, it would perforate a phone book eventually, but it was sloppy.
A simple piston/spring blowback design would be cool.
Any brilliant ideas floating around out there?

[ame="http://www.youtube.com/watch?v=EyHqz67c5q0"]Example of the vortex type[/ame]

-Mike