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One thing I have noticed regarding pinned/non pinned S&Ws is that most of the non pinned crush fit barrels have a slight constriction where the frame's threads surround the barrel shank. Most of my S&Ws are P&R models but I have a couple of newer ones (post 94) and you can clearly see the constriction where the frame "crushed" the barrel. It does not seem to be enough of a problem to affect the bullet's engagement with the rifling after squeezing through the tight spot but I feel the old method was better. The old P&R Smiths were assembled with greater care than the current ones and the fit and finishing is better and you almost never got an old one with a trigger pull that really needed any further "enhancement".
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