{"product_id":"smith-wesson-j-frame-mainspring-stirrup-mim-hammer-factory-new-oem-215860000","title":"Smith \u0026 Wesson J Frame Mainspring Stirrup MIM Hammer Factory New OEM - 215860000","description":"\u003ch2\u003eSmith \u0026amp; Wesson J Frame Mainspring Stirrup — MIM Hammer, Factory New OEM\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePart #215860000 | Factory New | J Frame | MIM Hammer Models | Multi-Caliber | OEM\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e⚠️ MIM Hammer Models Only.\u003c\/strong\u003e This stirrup is designed for J Frame revolvers fitted with MIM (Metal Injection Molded) hammers, which S\u0026amp;W transitioned to beginning around 1997. The MIM hammer has a different stirrup engagement geometry than pre-MIM (forged\/machined) hammers. Installing this stirrup in a pre-MIM J Frame will result in improper fit, light primer strikes, or failure to fire. Verify your hammer type before ordering.\u003c\/p\u003e\u003cp\u003eThe mainspring stirrup is the U-shaped link that connects the mainspring to the hammer, transmitting the mainspring’s stored energy to drive the hammer forward during the firing cycle. A worn, bent, or broken stirrup causes light primer strikes, inconsistent trigger pull weight, or complete failure to fire.\u003c\/p\u003e\u003ch3\u003eCompatible Models (MIM Hammer Variants)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e.22 LR:\u003c\/strong\u003e Model 317, 43C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e.22 WMR:\u003c\/strong\u003e Model 351C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e.32 H\u0026amp;R Mag:\u003c\/strong\u003e Model 331, 332, 431, 432\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e.38 Special:\u003c\/strong\u003e Model 337, 342, 438, 442, 637, 638, 642\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e.357 Magnum \/ AirLite:\u003c\/strong\u003e Model 340, 360\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify fitment:\u003c\/strong\u003e Model 60, 49 — confirm MIM hammer configuration with your gunsmith before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 215860000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Mainspring Stirrup\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e J Frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e MIM Hammer models only (post-~1997 production)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Factory New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM:\u003c\/strong\u003e Genuine Smith \u0026amp; Wesson factory part\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003eProfessional gunsmith installation recommended. Verify MIM hammer compatibility and function test trigger pull and primer strike depth after installation.\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":20944144924730,"sku":"215860000","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/products\/DSC08076.JPG?v=1571386877","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-j-frame-mainspring-stirrup-mim-hammer-factory-new-oem-215860000","provider":"USA Guns And Gear","version":"1.0","type":"link"}