{"product_id":"smith-wesson-k-frame-model-66-hammer-block-old-style-357-magnum-used-oem-part-66120","title":"Smith \u0026 Wesson K Frame Model 66 Hammer Block Old Style .357 Magnum — Used OEM Part 66120","description":"\u003ch2\u003eSmith \u0026amp; Wesson K Frame Model 66 Hammer Block Old Style .357 Magnum — Used OEM Part\u003c\/h2\u003e\n\u003cp\u003eGenuine Smith \u0026amp; Wesson OEM hammer block for the K Frame Model 66 Combat Magnum revolver chambered in .357 Magnum. The Model 66 is the stainless steel version of the K Frame .357 Magnum line. The hammer block is a critical passive safety component that physically prevents the hammer from contacting the firing pin unless the trigger is fully depressed. Without a functioning hammer block, a dropped revolver or an impact to the hammer could cause an unintended discharge. This is the old-style hammer block, which fits Model 66 through 66-3. The old and new style hammer blocks are \u003cstrong\u003enot interchangeable\u003c\/strong\u003e — verify your dash number before ordering. This used OEM part is inspected and functional, manufactured to original S\u0026amp;W specifications and tolerances.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCondition: Used — inspected and functional. Some fitting by a qualified gunsmith may be necessary.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 66120\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Smith \u0026amp; Wesson\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Hammer Block\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Old Style\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e K Frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Models:\u003c\/strong\u003e Model 66, 66-1, 66-2, 66-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .357 Magnum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used — genuine OEM part, inspected and functional\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"border-bottom: 2px solid #ddd;\"\u003e\n\u003cth style=\"text-align: left; padding: 8px;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 8px;\"\u003eFrame\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 8px;\"\u003eCaliber\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eModel 66 (original)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eK Frame\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e.357 Magnum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eModel 66-1\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eK Frame\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e.357 Magnum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eModel 66-2\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eK Frame\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e.357 Magnum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n\u003ctd style=\"padding: 8px;\"\u003eModel 66-3\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eK Frame\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e.357 Magnum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ Important:\u003c\/strong\u003e The old style hammer block does \u003cstrong\u003eNOT\u003c\/strong\u003e fit Model 66-4 and later. The 66-4 introduced a new style hammer block design that is not interchangeable with this part. Always verify your dash number before ordering.\u003c\/p\u003e\n\u003ch3\u003eFinding Your Model Number\u003c\/h3\u003e\n\u003cp\u003eSwing out the cylinder and look behind the yoke on the frame. The model number and dash number are stamped together (e.g., \"66-2\"). Model numbers were added starting in 1957–58.\u003c\/p\u003e\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis listing is for the hammer block only.\u003c\/strong\u003e All other action parts are sold separately.\u003c\/li\u003e\n\u003cli\u003eThe hammer block is a safety-critical component. Replacement by a qualified gunsmith is strongly recommended.\u003c\/li\u003e\n\u003cli\u003eAlways function test after installation to confirm proper hammer block engagement before carrying or firing.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":41628672557114,"sku":"66120","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/products\/DSC02472_a5fcf6ae-cc2d-4e6b-9518-02de03c3a321.jpg?v=1788356121","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-k-frame-model-66-hammer-block-old-style-357-magnum-used-oem-part-66120","provider":"USA Guns And Gear","version":"1.0","type":"link"}