{"product_id":"sw-k-frame-model-10-strain-screw-square-butt-blue-38-special-10173","title":"Smith \u0026 Wesson K Frame Model 10 Strain Screw Square Butt Blue Steel .38 Special – Part# 10173","description":"\u003ch2\u003eSmith \u0026amp; Wesson K Frame Model 10 Strain Screw – Square Butt | Blue Steel | .38 Special\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePart# 10173 | Used OEM Factory Part | Old Style | Blue Steel\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eModel Compatibility\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFrame\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eCaliber\u003c\/th\u003e\n\u003cth\u003eGrip Type\u003c\/th\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003eModel 10\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eBlue Steel\u003c\/td\u003e\n\u003ctd\u003eOld Style, Used\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eAlso compatible with other K Frame square butt models.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePart Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Strain Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrip Type:\u003c\/strong\u003e Square Butt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Blue Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Old Style\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used – OEM Smith \u0026amp; Wesson factory part\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e K Frame revolvers – Model 10 (.38 Special), square butt grip frame\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eFunction\u003c\/h3\u003e\u003cp\u003eThe strain screw threads into the bottom of the grip frame to secure the mainspring (hammer spring). It also allows for trigger pull adjustment — turning the screw in or out changes mainspring tension, affecting trigger pull weight and hammer strike force. Proper adjustment ensures reliable ignition with a comfortable trigger pull.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003eCan be installed by the owner with basic tools after removing grips. \u003cstrong\u003eNote:\u003c\/strong\u003e Too loose may cause light primer strikes; too tight may result in excessive trigger pull weight. A qualified gunsmith is recommended for final adjustment. Factory replacement parts are manufactured to exact OEM specifications and tolerances.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eHow to Identify Your S\u0026amp;W Model Number\u003c\/h3\u003e\u003cp\u003eSwing out the cylinder and check behind the yoke on the frame for the model number. Model numbers were introduced in 1957–58. If no model number is present, your revolver may pre-date 1957 — \u003cstrong\u003econtact us with your serial number\u003c\/strong\u003e and we can help identify the correct part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQuestions? Call or email us — we're happy to help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":40928016924730,"sku":"10173","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/s-l960_45_047c24db-263c-4a44-b1c6-22fd8395d6ef.webp?v=1751480806","url":"https:\/\/usagunsandgear.com\/products\/sw-k-frame-model-10-strain-screw-square-butt-blue-38-special-10173","provider":"USA Guns And Gear","version":"1.0","type":"link"}