The biggest difference is the extractor, with the no dash having the long extractor and the -2 having the small extractor, pretty much similar to all of the 3rd gens in appearance. They also change the barrel twist rate around the A200000 SN range to a lighter twist rate. Around the same SN range they changed the barrel bushing over to non-fully enclosed guide rod. Along with this the early -2 models had a hole in the hammer that disappeared around A100000.
Both the no dash and -2 versions of the Model 39 are great pistols. They are some of my favorites to shoot and look great doing it too.
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J.D. Roy
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