{"product_id":"smith-wesson-revolver-j-frame-model-63-22-lr-mainspring-stirrup-swivel-j63141","title":"Smith \u0026 Wesson J Frame Mainspring, Stirrup \u0026 Swivel .22 LR - Stainless Steel Used J63141","description":"\u003cp\u003e\u003cstrong\u003eGenuine Smith \u0026amp; Wesson J Frame Mainspring Assembly for Model 63\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFactory OEM mainspring assembly (also known as the hammer spring) designed for Smith \u0026amp; Wesson Model 63 .22 LR revolvers. This complete assembly includes the mainspring, stirrup, and swivel—critical components that provide the power for hammer operation in both single and double action modes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Details:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePart Number: J63141\u003c\/li\u003e\n\u003cli\u003eCondition: Used, excellent working condition\u003c\/li\u003e\n\u003cli\u003eMaterial: Stainless steel\u003c\/li\u003e\n\u003cli\u003eFrame Size: J Frame\u003c\/li\u003e\n\u003cli\u003eIncludes: Mainspring, stirrup, and swivel\u003c\/li\u003e\n\u003cli\u003eComplete assembly ready for installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFits Smith \u0026amp; Wesson Model 63 and other J Frame revolvers. Mainspring assemblies typically interchange within J Frame models regardless of caliber, making this suitable for various J Frame configurations including Models 34, 35, 36, 37, 38, 40, 42, 43, 49, 60, 63, 317, 331, 337, 340, 342, 351, 360, 442, 638, 640, 642, and 649.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFunction \u0026amp; Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe mainspring provides the force that drives the hammer forward to strike the firing pin. A properly functioning mainspring ensures reliable ignition and consistent trigger pull weight. Worn or weakened mainsprings can cause light primer strikes and misfires.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eProfessional gunsmith installation recommended. Requires proper compression and alignment of the mainspring assembly. Improper installation can affect trigger pull weight and hammer function. Factory parts are manufactured to exact OEM specifications and tolerances.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow to Identify Your Model:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSwing out the cylinder and check behind the yoke on the frame for the model number. Model numbers began in 1957-58. If no model number is present, contact us with your serial number for assistance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eAuthentic Smith \u0026amp; Wesson factory part for reliable restoration and repair of J Frame revolvers.\u003c\/em\u003e\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":41242067304506,"sku":"J63141","price":14.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/DSCF0001_a28df610-bc5b-4042-ab8e-c74ceba3334f.jpg?v=1770913865","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-revolver-j-frame-model-63-22-lr-mainspring-stirrup-swivel-j63141","provider":"USA Guns And Gear","version":"1.0","type":"link"}