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Break-Action Shotgun Seal

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Break-Action Shotgun Seal

Unread postAuthor: csgunner » Thu Jan 08, 2009 9:44 pm

alright, after finding out a spent 20 gauge shell make a perfect "shell" for 1/2" pipe (because of the flange at the end) I decided to make a break-action shotgun. Have never made one.

It looks simple enough to build, but i dont know about the seal in between the barrel and the other bit (where it breaks open)

Should I use sprinkler valve or other? suggest other

please give tips - pretty sure I could figure out the seal myself, but it would probly take awhile- couldn't find it on the search

see preliminary sketch for basic design (nuthin fancy)
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Unread postAuthor: inonickname » Thu Jan 08, 2009 9:48 pm

Wouldn't you be needing a pressure chamber for any real kind of power? It's probably best to just make a gasket and a locking mechanism to hold it shut. It'd be a fair bit simpler if it was built as a combustion.
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Unread postAuthor: VH_man » Thu Jan 08, 2009 10:51 pm

Have you seen how the "buzzy Bee" doubleshot works? (tis a nerf gun)

I reccomend you spend the 10 bucks it costs and get one. sure is not that great of a gun (mine is actually pretty good, dunno why people have so much trouble) but its a double-barrel shell ejecting shotgun. Check out that mechanism and you shall see how easy it is to make this.

Good luck, BTW. Cant wait to see it working.
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Unread postAuthor: willarddaniels » Thu Jan 08, 2009 11:57 pm

I think this is a great idea!
You could easily make it just as you have drawn and conceptualized, patterning your action and off of a normal break-barrel 20 ga.
I will have to go see for myself how well the spent shell fits inside the 0.5" PVC before I go making one (I am fairly anal and it has to fit very nicely.)

I just got my kids, oldest are 9 and 8, two 20 ga. shotguns for christmas, along with 500 shells. I imagine this spring we will have plenty of ammo for a 20 ga. spudgun.
btw, you can snugly fit 20 ga. 192 shells into a 30 cal ammo can, or over 3300 .22 shells.
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Unread postAuthor: Hubb » Fri Jan 09, 2009 8:29 am

Look for Goathunter's launchers. I believe he has posted two of them here, and both of them are break barrel type launchers.
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Unread postAuthor: twizi » Sun Jan 11, 2009 11:12 am

this has been done many times before like here http://www.spudfiles.com/forums/14-gauge-double-barrel-break-action-shotgun-t15521.html
but you could make the most awsome break action shot gun ever
good luck
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Unread postAuthor: csgunner » Tue Jan 20, 2009 4:20 pm

Yo thanks - found goathunter's gun may use an o-ring

I will have a pressure chamber, just left it off the drawing for clarity

The 20 Gauge shells fit very well, but I have had 1/2 pipe that have slightly different IDs and you might need one wrap of tape or something.
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