The S&W firing pins seem to vary quite a bit in terms of length....usually between .488" and .495". Apex and Cylinder and Slide both sell slightly longer ones, which are supposed to cure of the issues (misfires) attributed to the shorter OEM f. pins.
A couple of other well known things that can cause problems in the rimfires.....the cylinder assemblies and breechface must be kept as clean as possible, and the headspace should be checked to make sure it is correct. On the rimfires, the rear gauge (headspace) should be .008"-.010". (.008" is better)
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 05-03-2018 at 03:41 PM.
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