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Originally Posted by mykeal
Because I've done the free body diagrams and can see how the loads are distributed.
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If you assumed a reasonable application of loads, then you realize (because the geometry of an open top revolver results in a cantilever reaction) the center pin resolves all the load while the bottom strap serves to stabilize the cantilever. If the pin is in tension, then the bottom strap is in compression. With a full frame revolver both straps work together to resolve the load (the top strap taking more than the bottom since it's closer to the barrel and the center pin is not involved since it isn't fixed).
The cross-sectional area of a closed frame revolver's straps greatly exceed that of an open top revolver's center pin. Consequently, the corresponding unit stresses will be significantly greater in the open top's center pin given the same loading. (Actually, it's not the total area of the pin that's critical, but the contact area of the wedge.)
Since a closed frame revolver operates at much lower unit stress than a comparably loaded open top model (and, I've ignored the fact that a closed top revolver has moment resisting connections where the open top doesn't), IMHO
PetahW's expression "inherently stronger" is appropriate. That's my two-cents worth.