{"product_id":"sw-k-l-n-frame-power-rib-mainspring-new-swms222","title":"Smith \u0026 Wesson K, L \u0026 N Frame Power Rib Mainspring New Part SWMS222","description":"\u003cp\u003e\u003cem\u003eThis listing is for the Smith \u0026amp; Wesson K, L \u0026amp; N Frame \"Power Rib\" Mainspring — factory new OEM part.\u003c\/em\u003e\u003c\/p\u003e\u003cp\u003eThe mainspring (hammer spring) powers the hammer fall in your S\u0026amp;W double-action revolver, directly affecting trigger pull weight and ignition reliability. The \"Power Rib\" design provides consistent spring tension across the hammer's travel arc, delivering reliable primer strikes while maintaining a smooth, predictable double-action pull. A worn or broken mainspring can cause light primer strikes, misfires, or erratic trigger behavior.\u003c\/p\u003e\u003ch4\u003ePart Details\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SWMS222\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 Smith \u0026amp; Wesson\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Power Rib\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Frames:\u003c\/strong\u003e K, L \u0026amp; N Frame\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eModel Compatibility\u003c\/h4\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFrame\u003c\/th\u003e\n\u003cth\u003eExample Models\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003eModel 10, 13, 14, 15, 17, 19, 64, 65, 66, 67, 617\u003c\/td\u003e\n\u003ctd\u003e✓ Yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eL Frame\u003c\/td\u003e\n\u003ctd\u003eModel 581, 586, 681, 686, 619, 620\u003c\/td\u003e\n\u003ctd\u003e✓ Yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eN Frame\u003c\/td\u003e\n\u003ctd\u003eModel 24, 25, 27, 28, 29, 57, 629, 627\u003c\/td\u003e\n\u003ctd\u003e✓ Yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJ Frame\u003c\/td\u003e\n\u003ctd\u003eModel 36, 60, 442, 642\u003c\/td\u003e\n\u003ctd\u003e✗ No\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eX Frame\u003c\/td\u003e\n\u003ctd\u003eModel 500, 460\u003c\/td\u003e\n\u003ctd\u003eVerify before ordering\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eIf you are unsure whether this mainspring fits your specific model, please contact us before ordering.\u003c\/em\u003e\u003c\/p\u003e\u003ch4\u003eInstallation Note\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eGunsmith Recommended:\u003c\/strong\u003e Mainspring replacement requires proper disassembly of the side plate and grip frame. Some fitting may be necessary. Factory replacement parts are manufactured to the same specifications and tolerances as the original parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWe only ship to addresses within the United States.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":34327998410,"sku":"SWMS222","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/products\/download_e88e54ee-9827-4ce9-95d7-360819b22f44.png?v=1788532097","url":"https:\/\/usagunsandgear.com\/products\/sw-k-l-n-frame-power-rib-mainspring-new-swms222","provider":"USA Guns And Gear","version":"1.0","type":"link"}