![]() Features from the -3 engineering change, however, are more subtle as they include the new yoke retention system, radius stud package, hammer nose bushing, and floating hand. 1 features are easy to spot as the 66-1 and 66-2 differed in that the earlier model was pinned and recessed while the latter was not. You might inspect your revolver to see if it has any of the -1 or -3 features because, if it does, that could possibly be a clue as to the serial number anomaly. ![]() This is why you occasionally come across anomalies like a magnum-caliber revolver with recessed chambers and a crush-fit barrel or a pinned barrel and non-recessed chambers. This is because S&W has been known to use up existing stocks of parts prior to fully implementing the newest engineering change. ![]() ![]() Sometimes a S&W revolver made shortly after the introduction of an engineering change will have a mix of features between two dash numbers and/or an odd serial number. ![]()
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