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Breech Loading "Assault 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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Breech Loading "Assault Rifle"

Unread postAuthor: octane89 » Fri Oct 05, 2007 8:44 pm

This is my first pneumatic, and my 4th cannon. Let me know what you think on it and I'll have a updated picture of it tomorrow or the next when it's painted.

Specs
30in Barrel (1in ID)
20in Chamber (2in ID) **I think it's 20 inches long, but with the cap it seems longer**
*Note that I have installed two rubber blocks to seal off the stock, so it's the front half that actually is the only part pressurized.*
Breech Loading
Rainbird DV-100 Valve

I made a "slicer" out of a 3/4in coupling that is sharpened on one end to cut an apple or potato out to fit inside the barrel to fire as well.

Performance wise, at 35psi it shoots about 300yds roughly. I will pull my paintball chronograph out to see how many fps it has too. I got about a 3:1 Ratio too.

Pics of everything as a final product will be up soon. Possibly a video too.
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Marks.jpg
The product after assembly, before paint.
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Unread postAuthor: HaiThar » Fri Oct 05, 2007 8:46 pm

Nice, very similar to the gun I built. Your primer job was alot better than mine, though :D
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Unread postAuthor: potatoflinger » Fri Oct 05, 2007 9:13 pm

I hate to be the bearer of bad news, but some of the fittings on this cannon are dwv, or non pressure rated, so I wouldn't take it over 50-60 psi.
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Unread postAuthor: octane89 » Fri Oct 05, 2007 9:19 pm

Well what ones? Because they are all sch 40, I made sure of that.
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Unread postAuthor: benstern » Fri Oct 05, 2007 9:37 pm

sch-40 is a size standard. NOT A PRESSURE RATING!
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Unread postAuthor: Dornep » Fri Oct 05, 2007 9:41 pm

The bell reducers are DWV. They may be SCH40 but they have shallow socket depth. You can clearly see this on the chamber's bell reducer.

Overall nice cannon, save for the DWV fittings.

EDIT. If it really fire's 300 yards :shock: at 35psi I see no reason why you would need to take it over 40-50PSI..
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Unread postAuthor: Spuddin » Fri Oct 05, 2007 9:45 pm

man i really like this rifle, i want to make one just like it, very nice. have u got it painted yet? and how much was the bird.
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Unread postAuthor: octane89 » Sat Oct 06, 2007 12:21 pm

Dornep- I don't plan at running over 50psi ever. Believe me, 35psi is enough.

Benstrern-It seems like you have a problem with any post I have so far. I don't have a problem with anyone, so I hope you can understand the fact that Im learning as I go.

But thanks everyone for compliments so far, and the paint is drying so I may have pictures before work.

And the rainbird was $15 from my work- which is a hardware store.
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 06, 2007 12:27 pm

I don't plan at running over 50psi ever. Believe me, 35psi is enough.


You have no idea what you're missing ;)
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Unread postAuthor: octane89 » Sat Oct 06, 2007 12:30 pm

Haha- well thats my next project. I'll want more power eventually.
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Unread postAuthor: battlemonkey » Mon Oct 08, 2007 1:33 am

I take my pressure rated pvc up to 180psi and dont have problems apart from ocasional leaks from valves.
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Unread postAuthor: tsb » Fri Oct 12, 2007 5:19 pm

Nice,
octane, you really should listen to benstern, because, what would have happened if one day you decided to take it up abit and you went at 100psi??

well its good anyways.

Cheers, tsb
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Unread postAuthor: octane89 » Fri Oct 12, 2007 9:07 pm

I'm not saying I don't believe him-My statement was based on another post he had where I was talking about a supah valve.
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