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Old January 24, 2013, 02:15 PM   #7
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Join Date: December 11, 2004
Location: Redwood City, Ca.
Posts: 3,297

Below you can see a pinned and a non pinned barrel. The pin is located at the top of the frame just behind where the barrel enters the frame. The 29-2 on top has the pin while the more recent 629 below it, does not. Note too that the M29 is a carbon steel gun which has been nickel plated while the 629 is stainless steel. S&W used the "6" prefix to identify a stainless steel revolver.

Here you can see the recessed cylinder of the early 29-2.

Below is a non recessed cylinder of an early S&W in 44 Spl.

S&W recessed the cylinders of all guns in .22 l.r. and the magnum loadings, .357 Magnum and 44 Magnum for example. But did not recessed the cylinders of non-magnum guns. Others have explained when the practice ended. Better heat treatment made it unnecessary and it saved them money to delete it.

Get ahold of a copy of the "Standard Catalog of Smith and Wesson" which is a useful reference to have. The 3rd edition is the latest and can be found used for a lower price.

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