{"product_id":"smith-wesson-j-frame-mainspring-multi-model-hammer-spring-all-models-factory-new-071040000","title":"Smith \u0026 Wesson Revolver J Frame Mainspring\/Hammer Spring All Models - Factory New OEM - 071040000","description":"\u003ch2\u003eGenuine Smith \u0026amp; Wesson J Frame Mainspring - Multi-Model Compatibility\u003c\/h2\u003e\u003cp\u003eFactory new OEM mainspring (hammer spring) designed for all Smith \u0026amp; Wesson J Frame revolvers. This critical internal component provides the force needed to drive the hammer forward and strike the firing pin, ensuring reliable ignition with every trigger pull. Compatible with virtually all J Frame models from vintage to modern production.\u003c\/p\u003e\u003ch3\u003eKey Features:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Part:\u003c\/strong\u003e Authentic Smith \u0026amp; Wesson factory component, not an aftermarket substitute\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal J Frame Fit:\u003c\/strong\u003e Compatible with all J Frame models (see extensive compatibility list below)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCritical Fire Control Component:\u003c\/strong\u003e Provides proper hammer strike force for reliable ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory New Condition:\u003c\/strong\u003e Brand new, never installed, ready for immediate use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Manufactured:\u003c\/strong\u003e Meets Smith \u0026amp; Wesson's exact specifications for spring tension and durability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat-Treated Spring Steel:\u003c\/strong\u003e Engineered for consistent performance and long service life\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eExtensive Model Compatibility:\u003c\/h3\u003e\u003cp\u003eThis mainspring fits all Smith \u0026amp; Wesson J Frame revolvers, including but not limited to:\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eModels:\u003c\/strong\u003e 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 42, 43, 49, 50, 51, 60, 63, 317, 331, 332, 337, 340, 342, 360, 431, 432, 437, 438, 442, 460, 631, 632, 637, 638, 640, 642, 649, 651, 940\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e This mainspring is compatible with both centerfire and rimfire J Frame models, making it one of the most versatile internal parts in the J Frame lineup.\u003c\/p\u003e\u003ch3\u003ePart Number:\u003c\/h3\u003e\u003cp\u003eSmith \u0026amp; Wesson Factory Part Number: \u003cstrong\u003e071040000\u003c\/strong\u003e\u003c\/p\u003e\u003ch3\u003eWhat is a Mainspring?\u003c\/h3\u003e\u003cp\u003eThe mainspring (also called the hammer spring) is the powerplant of your revolver's fire control system. When you cock the hammer or pull the trigger in double-action mode, you compress the mainspring. When the sear releases, the mainspring drives the hammer forward with enough force to strike the firing pin and ignite the primer. A worn or weakened mainspring can cause light primer strikes, misfires, or failure to fire, especially with hard primers or in cold weather.\u003c\/p\u003e\u003ch3\u003eSigns You Need a New Mainspring:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eLight primer strikes or occasional misfires\u003c\/li\u003e\n\u003cli\u003eInconsistent ignition, especially with certain ammunition brands\u003c\/li\u003e\n\u003cli\u003eNoticeably lighter trigger pull than when new\u003c\/li\u003e\n\u003cli\u003eVisible wear, corrosion, or damage to the spring\u003c\/li\u003e\n\u003cli\u003eRevolver has been in storage for extended periods\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Choose Genuine OEM Parts?\u003c\/h3\u003e\u003cp\u003eWhen it comes to critical fire control components like mainsprings, genuine Smith \u0026amp; Wesson OEM parts ensure proper spring tension, heat treatment, and material specifications. The mainspring must provide exactly the right amount of force—too weak and you'll get misfires, too strong and the trigger pull becomes excessively heavy. Smith \u0026amp; Wesson mainsprings are precision-manufactured and tested to deliver consistent, reliable performance for thousands of cycles.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFast shipping on all in-stock Smith \u0026amp; Wesson parts. Order today to restore your J Frame revolver to factory specifications.\u003c\/em\u003e\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":32276867018,"sku":"071040000","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/products\/24_12_f9a8982c-67ea-48f9-92c6-59e1e70cfb53.jpg?v=1637687303","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-j-frame-mainspring-multi-model-hammer-spring-all-models-factory-new-071040000","provider":"USA Guns And Gear","version":"1.0","type":"link"}