{"product_id":"sw-k-frame-model-k38-pre-model-15-main-spring-38-special-15141","title":"S\u0026W K Frame Model K38 Pre-Model 15 Main Spring .38 Special – Part# 15141","description":"\u003ch2\u003eSmith \u0026amp; Wesson K Frame Model K38 Pre-Model 15 Main Spring – Old Style\u003c\/h2\u003e\n\n\u003cp\u003eRestore reliable hammer fall and trigger pull on your K38 or Pre-Model 15 with this factory-original main spring (mainspring). The main spring powers the hammer, providing the force needed to strike the firing pin with sufficient energy to reliably ignite the primer — a weak or broken mainspring causes light strikes, misfires, or complete failure to fire. This old-style blue steel spring is the correct replacement for the K Frame Model K38 (Pre-Model 15) chambered in .38 Special.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 15141\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Smith \u0026amp; Wesson K Frame Model K38 \/ Pre-Model 15\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .38 Special\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Main Spring (Mainspring \/ Hammer Spring)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Blue Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Old Style\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used (factory original)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Gunsmith fitting recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFactory Replacement Quality\u003c\/h3\u003e\n\u003cp\u003eGenuine Smith \u0026amp; Wesson factory part manufactured to the exact specifications and tolerances of the original — same spring rate, same dimensions, same reliable hammer energy. No aftermarket substitutes.\u003c\/p\u003e\n\n\u003ch3\u003eMain Spring \u0026amp; Trigger Pull\u003c\/h3\u003e\n\u003cp\u003eThe main spring is directly related to trigger pull weight — it works in conjunction with the strain screw to set mainspring tension. Replacing a worn spring with a factory-spec part restores the original trigger pull weight and ensures reliable primer ignition. Reduced-power aftermarket springs can lighten the trigger but risk light strikes, especially with hard primers.\u003c\/p\u003e\n\n\u003ch3\u003eAbout the K38 \/ Pre-Model 15\u003c\/h3\u003e\n\u003cp\u003eThe K38 Masterpiece (later designated the Model 15 Combat Masterpiece) is one of the most celebrated K Frame revolvers ever produced. Pre-model revolvers predate the 1957–58 model number system; if your revolver has no model number stamped behind the yoke, contact us with the serial number and we'll confirm compatibility.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuestions?\u003c\/strong\u003e Call or email us — we're happy to help you get the right part the first time.\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":40859745747002,"sku":null,"price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/s-l960_40_439b1201-ed01-4dc8-8485-6bbcd23f6057.webp?v=1745944468","url":"https:\/\/usagunsandgear.com\/products\/sw-k-frame-model-k38-pre-model-15-main-spring-38-special-15141","provider":"USA Guns And Gear","version":"1.0","type":"link"}