Semi- auto paintball gun

[Shrimphead]

I was thinking one day, and I came up with this semi-auto paintball gun design. It is largely based off of Clide's slider gun. When the coupler is in it's "rest" position (covering the holes on both pipes, it is held there with a spring), The chamber is filled up, sealing the piston agains the barrel. When it is pulled back, the chamber hole is opened, venting the pilot and sucking the piston back, firing the gun. Then the coupler is released, allowing the chamber to fill again.

I haven't come up with a loading system yet, so if you have any ideas, shout them out.

Any problems, concerns or ideas?

[Atlantis]

Basically, it's an inline-coaxial version of Clide's gun. One problem, having the breech in the chamber will deny you the ability to add a loading system for true, Semi-Auto functionality. Could I make a Slider out of a coupler and 2 bushings?

[Shrimphead]

Ya, I'll most likely change that so I can make loading system, because I really want it to be a "true" semi-auto gun.

How about this:

[Atlantis]

That is exactly what Clide's Slyder is.
http://www.spudfiles.com/forums/download.php?id=70&