SpudFiles

i am making a pen gun like jsr but everytime i try to make a piston gun it does not seal properly and all the air goes out the barrel while i try to pump it. does anybody know how to make a good piston for a pen gun and also i would like to know what i could use for a barrel.

pics

Have you tried this?

http://www.spudfiles.com/forums/making- ... t8919.html

Details of how you made your piston and seal would be help us help you

As to barrel material, check out your local hobby store - they should have a selection of brass and aluminium tubing of various diameters. If not, you can order such materials online.

The easiest option is to cast it out of epoxy or hot glue.
Or just find some random thing that fits in snuggly and convert it into a piston.

All, i have to say, is u tried to steal my name <_<

and as the others have said more info is needed for us to help you

wow, more people are getting into the pen gun thing , I think you should try making some larger scale coaxial pistons so you can have a bit of experience on this thing, small things like the pen gun are very hard to have everything go right for you, and everything is sealed in already once you make it.