You could modify a turd to fire out of an airsoft barrel, but I think he's looking to just fire .22's right out of the box, much less labour intensive.

Ya i am looking for an out of the box solution, it would be a lot better for repeatability and accuracy i assume. Just got a 6mm barrel today and ...

Thanks, did a bit of searching and found it. http://www.spudfiles.com/forums/adaptin ... t7178.html

Hey guys, i was just wondering if .22 pellets (5.5mm) will work in a 6mm ID barrel or is that too much clearence?
Has anyone done this before?

Ok i just went out and modified it but still no good?? i ran the 1/2 inch into the middle of the tee, cut down the piston size and still no good. it holds pressure fine but just leaks the whole lot out of the blow gun when fired, i can hear it open just at the very end of the blow guns exhausting ...

Copper and brass are pretty easy to file out (brass is a little harder). I just filed a brass fitting last night with little effort. Be patient and it'll work. How hard would it be for you to get a bigger tee? That would probably be the best bet.

I could get another tee no problem but i want to ...

Oh rite, i see where im going wrong now, this is what i need...
http://i41.photobucket.com/albums/e292/MB1380/Untitled-1.jpg

And this is what ive got....
http://i41.photobucket.com/albums/e292/MB1380/Untitled2.jpg

So i need to run the barrel further into the tee, only problem now is the lip on ...

Your piston face needs to be larger than the barrel.

This link should clear things up a bit. Notice how the size of the piston in relation to the barrel is? That's what needs to happen in yours. Oh, and it probably wouldn't hurt to cut your pilot volume a bit.

My piston is bigger alrite tho ...

Hey guys, ive been reading up here with a few months and decided to build a copper piston gun, i used a 3/4 3/4 1/2 tee for the piston holder and in using a blow gun for the trigger, also a 3/4 pipe for the cylinder.
Im a little short on fittings so what ive done is put a shrader valve on to a 3/4 ...