{"product_id":"sw-used-k-frame-model-13-strain-screw-round-butt-357-magnum-13172a","title":"S\u0026W Used K Frame Model 13 Strain Screw Round Butt .357 Magnum 13172A","description":"\u003ch3\u003eSmith \u0026amp; Wesson Used K Frame Model 13 Strain Screw — Round Butt\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 13172A\u003c\/p\u003e\u003cp\u003eGenuine OEM Smith \u0026amp; Wesson strain screw pulled from a round butt K Frame Model 13 revolver. Cleaned and inspected — a reliable surplus option for restoring or repairing your Model 13 at a fraction of new part pricing. The strain screw adjusts mainspring tension and is a key component in trigger pull tuning.\u003c\/p\u003e\u003ch4\u003eKey Features:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine S\u0026amp;W OEM Part:\u003c\/strong\u003e Factory original component\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used \/ Surplus — cleaned and inspected\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Round Butt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Adjusts mainspring tension; affects trigger pull weight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Replacement:\u003c\/strong\u003e Fits round butt K Frame Model 13 revolvers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatible Models:\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eSmith \u0026amp; Wesson K Frame Model 13 Round Butt (.357 Magnum \/ .38 Special)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eTechnical Specifications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Strain Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame Size:\u003c\/strong\u003e K Frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Round Butt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .357 Magnum \/ .38 Special\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Smith \u0026amp; Wesson (OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 13172A\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eInstallation Note:\u003c\/h4\u003e\u003cp\u003eDisassembly and reassembly required. Strain screw adjustment affects trigger pull — installation and tuning by a qualified gunsmith is recommended. Always function test after installation to ensure safe and reliable operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 Used S\u0026amp;W Strain Screw, Round Butt (Part #13172A)\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":39609125732410,"sku":"13172A","price":6.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/products\/DSC09861_a1b80e1b-a77e-4fc7-a11d-5c870be40515.jpg?v=1784228479","url":"https:\/\/usagunsandgear.com\/products\/sw-used-k-frame-model-13-strain-screw-round-butt-357-magnum-13172a","provider":"USA Guns And Gear","version":"1.0","type":"link"}