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groovy copper rifle

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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groovy copper rifle

Unread postAuthor: mobile chernobyl » Tue Dec 26, 2006 1:42 am

Well i got bored waiting for the parts for my 3" porting 3000 cu in mega cannon, so i decided to build a copper sniper rifle. my first venture into copper mind you...

[albumimg]276[/albumimg]

Chamber: appx 3+ feet of 1.25 inch copper pipe (i say 3+ cause of all the FRIGGEN EXPENSIVE copper fittings.)

Valve: combination metal/nylon/silicon piston with dual seals, very lightweight and works flawlessly (on the first try too!)

Valve Exhaust: 1/2" ball valve (also aids in filling, that design is soon to be changed tho) positioned with 1/2" black iron and fittings to be right near handle. very ergonomic and helps maintain the "sniper rifle" feel. to fire, thumb pushs ball valve lever forward fastly and user hears a pleasing loud "pshh" as projectile flys out barrel.

Barrel: 5ish feet of 1/2" copper pipe. soon to be replaced with alluminum or steel with a union to connect to existing copper (needs to be replaced because just the force of the hose clamps dented it and now AA batteries sometimes get stuck in it where they are)

I think it turned out pretty good. I don't usually do plumbing, so sweating the copper was kind of a hit or miss practice at first - But i can gas weld and braze pretty damn good. So i just made sure that there was plenty of lead in every joint then i tried to fillet it around the edges to make it look good/give me more peice of mind if im ever to venture above 110psi.

[albumimg]277[/albumimg]

First impressions...

HOLY SH!T haha. well actually it took me a while to figure out that the valve was not venting fast enough so the performance at first was like, wheres the beef??
I have to fill with the male fitting on then take it off to fire so that it vents fast enough. I think this will be solved when i put a bigger oring on the piston to help seal it.

[albumimg]278[/albumimg]

I'm planning on making a near duplicate of this gun, but with a 1" ish barrel and 1.5' of 2" Copper to replace the front most 1foot portion of the 1.25" copper lower stock. that should give it enough power for a different ammo...
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Unread postAuthor: noname » Tue Dec 26, 2006 2:22 pm

Damn, copper looks really nice on a gun like that. Very clean, sweet job. 8)
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Unread postAuthor: Flying_Salt » Tue Dec 26, 2006 2:40 pm

I wish copper was cheaper around here. Very nice. I should make a sniper-ish thing out of pvc sometime in the future. They look fun.
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Unread postAuthor: SpudStuff » Tue Dec 26, 2006 2:47 pm

Very Nice :!: I like the look of the polished copper.

You will gain preformance if you upgrade that 1/4" ball valve to a 3/8" or even 1/2" one.
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Unread postAuthor: MrCrowley » Tue Dec 26, 2006 3:04 pm

Woah, that is the coolest copper gun i've seen in a long time. :shock:
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Unread postAuthor: mobile chernobyl » Tue Dec 26, 2006 6:27 pm

Spudstuf - Hmm, i have noticed that, ill take note of that in my design im building tonight (nearly identical, but barrel will be big enough to launch a 12gr CO2 powerlet (sweet). This gun will retain the same dimentions, but ill have a 1.5' section of 2" copper in place of the 1.25" copper in the front of the stock.

more power... more bling 8)
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Unread postAuthor: Triggahappy » Wed Dec 27, 2006 6:01 pm

That is awesome! but it would cost me tonns to make :cry:
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Unread postAuthor: jrrdw » Wed Dec 27, 2006 8:03 pm

How long did it take you to build it? It's hard to see the tee in the 1st pic, but the 2nd one is a good view. What kinda tourch/gas you useing?

I'm no plumer eather.
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Unread postAuthor: mobile chernobyl » Fri Dec 29, 2006 1:07 am

jrrdw - It takes about 2-4 hours from start to end. take in mind that includes cutting the pipe, cleaning, aligning and whatnot. i just use a mapp gas set up that cost about $20 at home depot, but propane would work just as well, just not as fast.

triggahappy - yea they arent cheap, it cost me about 250 to make both, but im not a very good shopper and im sure parts could be found for less. If you ask me, it was definately worth it. they are so fun to shoot, and the design takes away the whole "spudgun" feel, even tho thats essentially wat they are based off of.

well heres the pics of both guns
[albumimg]281[/albumimg]

a little closer
[albumimg]282[/albumimg]

closer yet, with a better view of the valves and fill/exhaust pipe routing
[albumimg]283[/albumimg]

spudstuf - Thanks for the tip on upsizing the exhaust ball valve! i upgraded 1 size to a 3/8 valve and wow, instead of a "pshhhhh" when firing, its now a "psh" with a wicked ring to it. Tomarrow i have off work, so im going to toy around the the 12 gr ammo in the ".75 cal" and get some accuracy tests of the marble gun. hopefully ill have some good damage pics to put up.
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Unread postAuthor: MrCrowley » Fri Dec 29, 2006 1:52 am

holy sh*t those are the coolest looking copper guns i've seen...ever.
Great job I nominate you for the Congressional Medal of FuckingAwesomeness......btw no such thing exist.....yet :roll:
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