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My new over/under piston gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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My new over/under piston gun

Unread postAuthor: roughboy » Fri Apr 17, 2009 10:30 pm

This is my latest project please leave comments likes/dislikes. The gun is all metal with some brass fittings. I choose PVC for the barrel because the inner is smooth. the whole length of the gun is 2feet 9inch and not that heavy, it's easy to carry around. This is by far the most powerful gun i've made :twisted: .
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Attachments
pre.jpg
g.jpg
the gun
g.jpg (20.54 KiB) Viewed 3279 times
bl.jpg
the barrel with laser mounted on
bl.jpg (21.52 KiB) Viewed 3279 times
a.jpg
ammo loader
a.jpg (22.19 KiB) Viewed 3279 times
t.jpg
the trigger
t.jpg (23.93 KiB) Viewed 3279 times
Boys do what they can, Men do what they want
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Unread postAuthor: MrCrowley » Fri Apr 17, 2009 10:43 pm

Looks quite nice, what pressure do you run it at? Get some damage pictures/videos up too, I wanna see this thing in action :)

How's the ball valve trigger? Looks like you hip-fire this cannon with the trigger being at about your hip or maybe slightly further back?

Any other specs you can think of, add them to your post. :P
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Re: My new over/under piston gun

Unread postAuthor: jackssmirkingrevenge » Fri Apr 17, 2009 10:49 pm

roughboy wrote:This is my latest project please leave comments likes/dislikes.


I like it, but dislike the enormous pilot chamber volume.
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Unread postAuthor: daniel323 » Fri Apr 17, 2009 11:06 pm

love the all metal look

i weould think to make the barrel longer for better velocity but your probably going for more power at a shorter distance :wink:

i would love to see a video of it firing.

keep it up
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Unread postAuthor: Brian the brain » Sat Apr 18, 2009 1:10 am

You don't need the extra T in the pilot area if you fill through the handle.Just make sure you remove the schrader valve-stem.

If you made your piston right, it will surely actuate ( via bv)through an empty schrader.

Copper and aluminium are very suited to be used as a barrel.

The pvc ballvalve breechloader is very nice, but I'd go high pressure with this one ( effectively a sawed-off) so out with the PVC, in with metal!
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: qwerty » Sat Apr 18, 2009 3:34 am

What range and accuracy do you get also try it with a smaller bore barrel to fire ball bearings
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Unread postAuthor: AdiabaticManiak » Sat Apr 18, 2009 3:40 am

Nice shotgun style cannon you´ve got there! I like how the chamber is mounted, and for some esthetically bonus points you could make yourself some kind of soft grip along the chamber.

A nice job done!
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Unread postAuthor: sniper hero » Sat Apr 18, 2009 3:53 am

good work

you could make a pump action reload system
just cut out a square out of the pipe where now the ballvalve is
then slide a pipe over it and a pice of pipe over the chamber
connect those pipes and TADA!
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coming: semi auto pellet sniper:D
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Unread postAuthor: SubsonicSpud » Sat Apr 18, 2009 5:03 am

Nice gun, I like the layout. Definatly remove that tee in the pilot area, and as BTB said, stick on a copper barrel and crank up the pressure :twisted:

SubsonicSpud
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Unread postAuthor: Gaderelguitarist » Sun Apr 19, 2009 12:53 am

Nice cannon!

Take off that extra T like everyone is saying though.

A pump action system would probably make this a lot more fun to shoot and they're not difficult to build.
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 19, 2009 1:13 am

Gaderelguitarist wrote:A pump action system would probably make this a lot more fun to shoot and they're not difficult to build.


If that were true there'd be a lot more of them around ;)
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Unread postAuthor: psycix » Sun Apr 19, 2009 6:51 am

Nice gun indeed! I suggest you get a fridge compressor!
What pressure do you currently run it at?
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Unread postAuthor: Gaderelguitarist » Sun Apr 19, 2009 1:11 pm

jackssmirkingrevenge wrote:
Gaderelguitarist wrote:A pump action system would probably make this a lot more fun to shoot and they're not difficult to build.


If that were true there'd be a lot more of them around ;)



Well I guess I better get off my rump and post the pump action I made so we can spread some of the knowledge. :D
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 20, 2009 12:17 am

Gaderelguitarist wrote:Well I guess I better get off my rump and post the pump action I made so we can spread some of the knowledge. :D


Come to think of it, with a bit on ingenuity it really isn't that hard. Here's a design I had come up with a couple of years ago, never built it though - it's full auto or bust!

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Unread postAuthor: Gaderelguitarist » Mon Apr 20, 2009 11:17 am

Thats the idea behind mine, though i incorporated a spring to reset the sleeve.

How would this design achieve full auto? :?
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