SpudFiles

Here is my coaxial marble gun. I used 1/2" copper for the barrel and 2" sch40 for the chamber. I might replace the ball valve with a sprinkler valve soon though, this ball valve was all i had at the time.




Also here's the some pics of the piston, the bumper, and inside the gun.

Front of the piston


Back of the Piston - I had to use the piece of pipe so the piston would bump into the bumper instead of the male adapter


Inside the gun


Bumper - Its not very elegant, but it works!


Damage Pics

Marble gun damage compared to pumpmaster 760 bbgun at 10 pumps
and cloud .177 cal bbmg



back of aluminum plate where marble went through

Nice, how did you connect the copper to the PVC?

I used a 1/2" to 3/4" reducer then hooked that to a 3/4 male adapter, that to a 3/4" to 1" reducer, then the 1" reducer to a 1 and 1/2" reducer, and that to a coupling. I made a mistake in my first post, my chamber is 1 and 1/2" not 2".

Thanks, i'm thinking of doing something similar to this.

Nice. Any details on the valve? Piston, diaphragm?

i used a coupler for the body of the piston and a disk of 3/16" hard neoprene
off of mcmaster for the sealing end. used a sander the grind the coupler down. I will post a pic of the piston and inside the gun in a few minutes. It's probably be a 1/4" coupler for the piston , i don't know cause i ground away the writing on it.

i just added pics of the piston, bumper, and inside the gun to my first post.

i have been wanting to make a piston operated gun for a while but i dont know how to get there air out to have the piston come back and by the way really nice gun

dude u just use a ball valve, sprinkler valve, blowgun, just any kind of valve to get the air behind the piston out.

good gun but my only suggestion is stick with one or the other copper or pvc

ballad of NJ wrote:good gun but my only suggestion is stick with one or the other copper or pvc

now, why would you say something idiotic like that?

nice coaxil design. ive been wanting one. now i might just make one.

Great Gun