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Doubleriflejack

Thanks for your cent's worth. I still don't agree with that statement.. barrels start to recoil up and to the side while bullet is still in the barrel, and same time bending a little in UP direction ! That reaction then means they are trying to CLOSE breech tighter, right ? THEN, how can
that same reaction at same time, try to OPEN action ? Makes no sense to me, LOGIC tells us different.

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When you fire the right barrel the breech tries to open on that side however the barrels pivot left in the horizontal plane around the hinge pin so the breech closes more tightly on the left side (the opposite side). This is where a top rib extension comes in handy.

In the vertical plane the barrels pivot up and down around the axis of the hinge pin so when you fire either side the force tries to separate the barrels from the breech face (equal and opposite). Because the barrels can only rotate around the hinge pin the result is that the action stretches slightly and tries to open. This is where double locking underlugs and a third bite are useful.

It is the recoil that lifts the muzzle up and to the right when the right barrel is fired as the rifle pivots around the point where the stock meets the shoulder.

Just different vertors of force (magnitude and direction) combined to give a resultant. Thats the way I look at it.

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