And a positive catch such as the Springfield has to secure the breech block in battery.GeorgeGaskill wrote:You should take a look at the trap door Springfield design. The hinge pin on that is actually above the barrel. If the hinge point were below the barrel, which would be possible with the design you have shown, the bottom corner of the breech block would pivot clear of the inside corner and little or no angling of the standing breech would be required for the breech block to move freely. You would probably want a small radius on that corner anyway.
just say'n