{"product_id":"sw-k-frame-model-66-1-bolt-spring-plunger-357-magnum-part-6645","title":"Smith \u0026 Wesson K Frame Model 66-1 Bolt Spring \u0026 Plunger .357 Magnum Stainless Steel Old Style Used 6645","description":"\u003ch3\u003eK Frame Model 66-1 Bolt Spring \u0026amp; Plunger - Factory OEM Part\u003c\/h3\u003e\n\u003cp\u003eThis genuine Smith \u0026amp; Wesson bolt spring and plunger assembly is designed specifically for K Frame Model 66-1 revolvers chambered in .357 Magnum. Manufactured in stainless steel with the old-style configuration, this used factory part ensures reliable cylinder lockup and timing.\u003c\/p\u003e\n\u003ch3\u003eKey Features \u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e K Frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e 66-1 (old style)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .357 Magnum (centerfire)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used, functional OEM part\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 6645\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThis bolt spring and plunger fits Smith \u0026amp; Wesson K Frame Model 66-1 revolvers. K Frame internal parts are generally interchangeable across centerfire models (10, 11, 12, 13, 14, 15, 16, 19, 53, 64, 65, 66, 67), with the exception of hammers which are caliber-specific.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose This Part\u003c\/h3\u003e\n\u003cp\u003eWhen your revolver's cylinder lockup feels loose or timing is off, the bolt spring and plunger are often the culprits. This factory Smith \u0026amp; Wesson component restores proper cylinder alignment and ensures your revolver locks up tight with every trigger pull—critical for accuracy and safety.\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":32040460484666,"sku":"","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/DSC09954.jpg?v=1767634348","url":"https:\/\/usagunsandgear.com\/products\/sw-k-frame-model-66-1-bolt-spring-plunger-357-magnum-part-6645","provider":"USA Guns And Gear","version":"1.0","type":"link"}