The original OEM part number is 06048. The OEM spring is approx 5.25" long. with a wire diameter of .042".
It is normal for a new recoil spring to be approx. .50" longer than one at the end of it's life. (when comparing identical part #s) The older spring will take a set over time and end up being shorter.
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Ret. LE, FA Instr, S&W Armorer
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