S&W K Frame M&P 1st Model 4-Screw Main Spring .38 Colt – Part# MPC13 surplus Part number: WG12

Part number: WG12

Factory Smith & Wesson part #14389

Questions about compatibility with your Shield

J435 Smith & Wesson Used J Frame Model 32 Case Hardened Grooved

This is an original Smith & Wesson factory replacement hand for the K Frame Model K22 (4-Screw) revolver chambered in

S&W K Frame M&P 1st Model 4-Screw Main Spring .38 Colt – Part# MPC13 surplus Part number: WG12Smith & 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