{"product_id":"smith-wesson-k-frame-hammer-block-models-17-18-18120","title":"Smith \u0026 Wesson K Frame Hammer Block - Models 17 \u0026 18 - Old Style - Used - .22 LR 18120","description":"\u003cp\u003e\u003cstrong\u003eFactory OEM Smith \u0026amp; Wesson K Frame Hammer Block\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 18120\u003cbr\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e K Frame Models 17 \u0026amp; 18\u003cbr\u003e\u003cstrong\u003eCaliber:\u003c\/strong\u003e .22 LR (Rimfire)\u003cbr\u003e\u003cstrong\u003eStyle:\u003c\/strong\u003e Old Style\u003cbr\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Used\u003cbr\u003e\u003cstrong\u003eFrame Size:\u003c\/strong\u003e K Frame\u003c\/p\u003e\n\u003cp\u003eThis is an authentic Smith \u0026amp; Wesson factory hammer block (also called a firing pin block or safety block) for K Frame Models 17 and 18 revolvers. The hammer block is a critical safety component that prevents the firing pin from contacting the primer unless the trigger is fully pulled.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Smith \u0026amp; Wesson factory part\u003c\/li\u003e\n\u003cli\u003eOld-style configuration for early production models\u003c\/li\u003e\n\u003cli\u003eUsed condition with functional operation\u003c\/li\u003e\n\u003cli\u003eDirect replacement for worn or damaged hammer blocks\u003c\/li\u003e\n\u003cli\u003eEssential safety component preventing accidental discharge\u003c\/li\u003e\n\u003cli\u003eEnsures firing pin only contacts primer when trigger is pulled\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e The hammer block is interchangeable across all K Frame models, both rimfire and centerfire. This part will fit Models 10, 12, 13, 14, 15, 16, 17, 18, 19, 48, 64, 65, 66, 67, 617, and 648. The \"old style\" designation refers to earlier production variants.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction:\u003c\/strong\u003e The hammer block is a critical safety mechanism that physically blocks the firing pin from moving forward unless the trigger is fully pulled to the rear. This prevents accidental discharge if the revolver is dropped or the hammer is struck. A worn or damaged hammer block can compromise the safety of the firearm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e Professional gunsmith installation required. The hammer block is an internal safety component that requires complete disassembly of the revolver. Proper fitting and function testing are essential for safe operation. This is a critical safety part - improper installation can result in dangerous malfunctions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to Identify Your Smith \u0026amp; Wesson Model:\u003c\/strong\u003e Swing out the cylinder and check behind the yoke on the frame for the model number. Model numbers began in 1957-58. If you need assistance identifying your revolver or confirming compatibility, contact us with your serial number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestions?\u003c\/strong\u003e Contact us at \u003ca href=\"mailto:sales@usagunsandgear.com\"\u003esales@usagunsandgear.com\u003c\/a\u003e or call 770-544-8075. We specialize in Smith \u0026amp; Wesson pistol and revolver parts - new, used, NOS, and refurbished.\u003c\/p\u003e","brand":"Smith and Wesson","offers":[{"title":"Default Title","offer_id":40144656433210,"sku":"18120","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/DSC00079_682e3c5e-53e3-4f98-839e-5c29fa101836.jpg?v=1700065715","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-k-frame-hammer-block-models-17-18-18120","provider":"USA Guns And Gear","version":"1.0","type":"link"}