{"product_id":"smith-wesson-model-43-airweight-j-frame-main-spring-stirrup-swivel-blue-steel-22lr-142-43-k","title":"Smith \u0026 Wesson Model 43 Airweight J Frame Main Spring, Stirrup \u0026 Swivel Blue Steel .22 LR, Part# 142-43-K","description":"\u003ch2\u003eSmith \u0026amp; Wesson Model 43 Airweight Main Spring, Stirrup \u0026amp; Swivel – Part# 142-43-K\u003c\/h2\u003e\u003cp\u003eThis is a genuine factory Smith \u0026amp; Wesson mainspring, stirrup, and swivel set for the J Frame Model 43 (.22\/.32 Kit Gun Airweight) revolver chambered in .22 Long Rifle. A used blue steel set in serviceable condition — a cost-effective solution for restoring your Model 43 Airweight's mainspring assembly.\u003c\/p\u003e\u003cp\u003eThe stirrup is the U-shaped link that connects the mainspring to the hammer, transferring spring energy to drive the hammer forward during firing. The swivel allows the stirrup to pivot smoothly through the firing cycle. Together with the mainspring, these three components form the core of the revolver's hammer-driving assembly. A broken stirrup, fatigued mainspring, or damaged swivel results in light hammer strikes, misfires, or complete failure to fire.\u003c\/p\u003e\u003ch3\u003ePart Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 142-43-K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Name:\u003c\/strong\u003e Main Spring, Stirrup \u0026amp; Swivel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Blue Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used, factory original\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e J Frame (Airweight — alloy frame)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .22 Long Rifle (rimfire)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Mainspring + stirrup + swivel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Drives hammer fall in DA and SA operation; core of mainspring assembly\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eModel Compatibility\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eCaliber\u003c\/th\u003e\n\u003cth\u003eFrame\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 43 Airweight (.22\/.32 Kit Gun)\u003c\/td\u003e\n\u003ctd\u003e.22 LR (rimfire)\u003c\/td\u003e\n\u003ctd\u003eJ Frame Alloy\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 43C\u003c\/td\u003e\n\u003ctd\u003e.22 LR (rimfire)\u003c\/td\u003e\n\u003ctd\u003eJ Frame Alloy\u003c\/td\u003e\n\u003ctd\u003e⚠️ Verify fitment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 317 (Kit Gun)\u003c\/td\u003e\n\u003ctd\u003e.22 LR (rimfire)\u003c\/td\u003e\n\u003ctd\u003eJ Frame Alloy\u003c\/td\u003e\n\u003ctd\u003e⚠️ Verify fitment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 34 (.22\/.32 Kit Gun)\u003c\/td\u003e\n\u003ctd\u003e.22 LR (rimfire)\u003c\/td\u003e\n\u003ctd\u003eJ Frame Steel\u003c\/td\u003e\n\u003ctd\u003e⚠️ Verify fitment — different frame material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 63\u003c\/td\u003e\n\u003ctd\u003e.22 LR (rimfire)\u003c\/td\u003e\n\u003ctd\u003eJ Frame Stainless\u003c\/td\u003e\n\u003ctd\u003e⚠️ Verify fitment — different finish \u0026amp; frame material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 36 \/ 37 \/ 38\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eJ Frame\u003c\/td\u003e\n\u003ctd\u003e⚠️ Verify fitment — centerfire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eK \/ L \/ N Frame\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003eLarger frames\u003c\/td\u003e\n\u003ctd\u003e❌ Different frame size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eNote: The Model 43 Airweight uses an alloy (aluminum) frame — parts may not interchange with steel or stainless J Frame revolvers. This mainspring assembly is blue steel finish. Mainspring components are frame-specific and not interchangeable between J, K, L, or N Frame revolvers. Always confirm your exact model before ordering. Model numbers are stamped on the frame behind the yoke when the cylinder is swung out. Pre-1957 revolvers may not have a model number — contact us with your serial number for assistance.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003eMainspring, stirrup, and swivel replacement requires grip and side plate removal and disassembly of the mainspring assembly. We recommend installation by a qualified gunsmith to ensure correct spring tension and reliable hammer fall in both DA and SA operation.\u003c\/p\u003e\u003cp\u003eQuestions about fitment? Call or email us — we're happy to help.\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":40804654481466,"sku":"142-43-K","price":16.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/DSC06563.jpg?v=1741623790","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-model-43-airweight-j-frame-main-spring-stirrup-swivel-blue-steel-22lr-142-43-k","provider":"USA Guns And Gear","version":"1.0","type":"link"}