S&W K Frame M&P 1st Model 4-Screw Main Spring .38 Colt – Part# MPC13 surplus Questions about compatibility with your

Questions about compatibility with your Shield

and production era before ordering

Part Number: KL161B

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S&W K Frame M&P 1st Model 4-Screw Main Spring .38 Colt – Part# MPC13 surplus Questions about compatibility with yourSmith & Wesson K Frame Military & Police 1st Model Main Spring 4 Screw, Old Style A rare factory original main spring (mainspring) for the earliest production K Frame revolvers. This part was sourced from a Military & Police 1st Model revolver (Serial# 3312) chambered in . 38 Colt one of the earliest S&W hand ejector revolvers ever produced. The main spring powers the hammer, providing the force needed to strike the firing pin with sufficient energy