SpudFiles

I've tried this type of breech in a gun (that can't be discussed because of forum rules)
without any rubber seal it was airtight!!! just metal to metal.I think it's because the way the barrel rotates..it can apply a lot of force onto the seal.
When done correctly it will "jam" shut, not needing anything to keep it closed.

ohhk,well that idea is taxed!looks simple and i think i might give it a try.thanks mate.

Hey can i have some instructions plz. i like the idea but dont know how to build it. wouldnt it be better to have a seal

You could have a repair coupling behind the break with a spring behind it. The hinge that the barrel is attached to could also have a spring to open it when the repair coupling is pulled back.


One sec and I'll make a diagram...

Crazykid, take a look at mine, it's similiar to Brian's but with a few twists to make it work on a pneumatic. http://www.spudfiles.com/forums/goats-gun-t7859.html
Any questions just ask me.

Here are the mods I propose:

I experamented with something like this and couldnt get the darn thing to seal properly! but now you got you diagrams up i might go and dig it up and have another go!

Bubba

ginsuguy is that design airtight because of the coupler. if it is Than i make it . Do you know good ammo fo 2in barrel i need that 2

wait do you need a coupling, do you use a coupling brian yet you say its airtight

A screw type coupler isn't needed to make it air tight but it does simplify the building and alignment.The type in the diagram will work but won't be as air tight as a screw on.
Crazykid,Nerf footballs are always fun for a 2" barrel.Or the old fashioned Spud