lolz, yes, S&W is not as simple as model 10, 15, and 19 by any means!
Both the pinning and the recessing were for a reason, but neither are necessary. I don't know of any functional difference between pinned and non pinned guns. The pin is to prevent the barrel from backing out of its threads, but that has not been an issue even on non pinned barrels. The recessed cylinder was for magnum cartridges that supposedly were more likely to blow out just above the rim of the brass without it, but I've never heard of that happening with non recessed cylinders.
To bring this thread back up I will add my experience. The only revolver I have ever shot that had brass crack or blow out on the bottom of a case was a pinned and recessed 38 spl, I don't remember the number but I do remember wondering WTF would cause it. It was some load with DEWC's that I was handed to shoot the gun so I have no idea of times loaded or the actual load but it was an interesting experience anyways.
Looks, the recessed cylinder hides the rims of the cartridges. There's not really a functional difference. In fact, as far as function, without the recessed cylinder it is easier to check and see if the gun is loaded.
Both the pinning and the recessing were for a reason, but neither are necessary. I don't know of any functional difference between pinned and non pinned guns. The pin is to prevent the barrel from backing out of its threads, but that has not been an issue even on non pinned barrels. The recessed cylinder was for magnum cartridges that supposedly were more likely to blow out just above the rim of the brass without it, but I've never heard of that happening with non recessed cylinders.
Both required more machine work, so they cost more to do, so as they are not necessary, they were removed from the production.
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