Thanks for all the help and the quick replies. I am currently out of the country on business right now but when I return I will take some pictures and try to get the leaking problem fixed.

It could be the bolt so I will try that first.

I made a 3" slug out of plywood before I left and bolted it ...

Ok. Sorry.

My piston is serviceable. I will try to take some pictures of it latter and post them.

Well I took it out to my field yesterday to see how far it would shoot and I am pretty impressed with the results.

Shoot it three times:
95psi - 420yrds
90psi - around 405yrds
and 85psi - a little ...

Well I am not arguing with you because I do not know which is best. I just researched a lot of different guns and the ones that listed the best performance all used sprinkler valves with a blow gun attached.

I have to say that with just the 1/2" ball valve this thing is extremely powerful and very ...

Right now I am using a cheap 1/2" pvc ball valve because I haven't had time to install my sprinkler valve and it is very powerful. It blew a huge hole in 3/4" plywood from 50' away using 80psi.

I would love to see what this thing will do when I get my sprinkler valve fitted.

Really?

A lot of the piston guns I have seen on the forum still use sprinkler valves.

I would rather use a blow gun since it would save about 15 bucks and cut down on the over all bulkiness of the gun.

If you would not mind could you please explain this a little more.

Could you just put a barb ...

Because the ball valves are a not as easy to use. I was also told that I would have better performance with a sprinkler valve.

If this is not correct please let me know. I am new to this hobby so any constructive criticism is welcome.

Here is quick layout of the gun that I am talking about. It is a rough draft but I think it will explain what I am talking about.

I cut all the pipes with a Miter Saw.

Thanks for the replies.

I am not really sure how to post pictures.

Barrel Sealer. The Chamber is connected to the piston housing using two tees.

Gun is similar to "MrCrowley" Golf Ball Cannon

Hello,

I have made my first 2" piston gun and I have to say this thing is a beast. Extremely load and powerful.

After about the first 3-4 shots I noticed that air was leaking out around the rubber seal on the piston and coming out the barrel. The gun will still fire but you have to be quick to ...

Does the bolt run all the way through? Rubber washers?

Thank very much.

I know what a pill bottle looks like!! I wanted to see what the finished bottle looks like.

I am curious how the pill bottle looks

could you email me a pic of your finished piston?

Edit by MrC: Post the picture, don't email. This is a forum.