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Both firing pins should be spring loaded with strong enough springs to keep the pins from striking the primers.
May I suggest making the fining pins out of Beryllium Copper? Kind of like what Charter Arms did to their revolvers.
See the firing pins have to much inertia. That is the problem. The recoil trows the second pin forward to fire the other barrel.
You need a combination of lighter pin and heavier springs.
That way you might not have to increase the power of the hammer spring (and thus trigger weight.)
Deaf
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