SpudFiles

But you live in america, its costs me £40 ($80) if i want to make a 2" ported piston. Here, its cheaper to get the sprinkler valve and you know that it will be reliable.

@ipaintball
Your last 2 inch tee piston cost $10. It probably ported 1 and a half inches.

To fire tennis balls you want something that can port 2 inches at least, which means 3 or 4 inch tees more than likely which will run 10+ bucks by themselves. Then you need the fittings and whatnot. But I agree it is still cheaper in America to build a piston than buy a 2 inch sprinkler.

I tried the conduit yesterday, and the tennis ball fits tight but it can be rammed into place just like the pressure rated stuff. I have found a new, cheaper source of awesomeness (that may be a bit extreme but it is nice nonetheless).

Anyway... I finished my gun and I'm going to shoot it soon (glue is drying)

It seems like tennis balls are EXTREMELY tight inside 2.5" sch40. So tight, in fact, it's damn near impossible to get them in there. I can't see how a spud gun could push them out with any decent results when there would be so much friction.

I guess I'll just have to wait and see.

It actually works quite well

My uncle does a lot of general contracting and has a 1 foot section of 2.5 inch PVC. It is the same size and dimensions as 2.5 inch sch 40 electrical conduit. The fittings are still as hard to come by. And conduit is not pressure rated so don't use it for anything other than the barrel. But they are the same size of pipe.

PVC Arsenal 17 wrote:I can't see how a spud gun could push them out with any decent results when there would be so much friction.

It actually works better this way, the tighter the fit (within reason) the more the Tennis Ball will resist the pressure building up behind it, eventually, the longer the TB is lodged in the barrel means the more pressure being released behind it, more pressure = more power.
You will get the best results only if the inside of the barrel is smooth, if you were to sleeve one pipe inside the other, you would need to fill that gap up otherwise you will lose air through it.

I guess you were right. I shot my gun today...

Unfortunately, words do not do justice to the state of awe I was in!

dont ya love that feeling? lol

if the tbs are too tight could you take off the 'fluff' ? it would also increase range because there would be less drag.

taking the fluff off would expose the rubber thus causing friction, maybe if you lubed it up it might increase velocity