{"product_id":"k-frame-strain-screw-round-butt-old-style-64172b","title":"K Frame Strain Screw Round Butt Old Style 64172B","description":"\u003cp\u003e\u003cstrong\u003eSmith \u0026amp; Wesson K Frame Strain Screw - Round Butt, Old Style\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFactory OEM strain screw for Smith \u0026amp; Wesson K Frame revolvers with round butt grips. This essential component secures and allows adjustment of the main spring (hammer spring) tension, directly affecting trigger pull weight and hammer strike force.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFrame: K Frame\u003c\/li\u003e\n\u003cli\u003eGrip Style: Round Butt\u003c\/li\u003e\n\u003cli\u003eDesign: Old Style\u003c\/li\u003e\n\u003cli\u003eCondition: Used, factory original\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible Models:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFits K Frame revolvers with round butt frames including Models 10, 12, 13, 15, 19, 64, 65, 66, 67 and other round butt K Frame variants. The strain screw is interchangeable between both centerfire and rimfire K Frame models with round butt grips.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe strain screw threads into the bottom of the grip frame and retains the main spring. By adjusting the strain screw in or out, you can increase or decrease main spring tension, which affects trigger pull weight and hammer strike force. Proper adjustment ensures reliable ignition while maintaining a comfortable trigger pull.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRound Butt vs Square Butt:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRound butt K Frames have a shorter, rounded grip frame for better concealment. This strain screw is specifically for round butt models. Square butt models use a different length strain screw.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eInstallation requires removal of the grip panels. The strain screw should be adjusted carefully to achieve proper main spring tension - too loose can cause light primer strikes, too tight can result in heavy trigger pull.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e This is a genuine Smith \u0026amp; Wesson factory part in used condition. Compatible with all round butt K Frame models regardless of caliber (centerfire or rimfire).\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":41241946325050,"sku":"64172B","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/products\/DSC09303_5d68806e-c4da-41c4-88d4-c46eb4242fd6.jpg?v=1770907596","url":"https:\/\/usagunsandgear.com\/products\/k-frame-strain-screw-round-butt-old-style-64172b","provider":"USA Guns And Gear","version":"1.0","type":"link"}