{"product_id":"sw-k-frame-strain-screw-square-butt-blue-steel-old-style-used-173g","title":"Smith \u0026 Wesson K Frame Strain Screw Square Butt Blue Steel Old Style - Used - 173G","description":"\u003ch2\u003eSmith \u0026amp; Wesson K Frame Strain Screw — Square Butt, Blue Steel, Old Style\u003c\/h2\u003e\u003cp\u003eThis factory original strain screw is a small but critical component in your K Frame revolver. It threads into the grip frame and bears against the mainspring, allowing you to tune trigger pull weight — tightening increases spring tension for more reliable ignition, while backing it out slightly reduces pull weight for competition use.\u003c\/p\u003e\u003cp\u003ePulled from a Model 17-3 .22 LR revolver, this old-style blue steel screw fits all K Frame square butt models regardless of caliber.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eStrain screw (blue steel)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 173G\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used, fully functional\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame:\u003c\/strong\u003e K Frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrip Frame:\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\u003eSource Model:\u003c\/strong\u003e Model 17-3 (.22 LR)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eModel Compatibility\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFrame\u003c\/th\u003e\n\u003cth\u003eCaliber\u003c\/th\u003e\n\u003cth\u003eGrip\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 10\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 12\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 13\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.357 Magnum\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 14\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 15\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 16\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.32 Long\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 17 \/ 17-3\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.22 Long Rifle\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eSource model — direct fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 18\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.22 Long Rifle\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 19\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.357 Magnum\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 48\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.22 Magnum\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 53\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.22 Jet\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 64\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 65\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.357 Magnum\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 66\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.357 Magnum\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel 67\u003c\/td\u003e\n\u003ctd\u003eK Frame\u003c\/td\u003e\n\u003ctd\u003e.38 Special\u003c\/td\u003e\n\u003ctd\u003eSquare Butt\u003c\/td\u003e\n\u003ctd\u003eVerify old-style fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eNote: Fits K Frame square butt models only. Not compatible with K Frame round butt configurations. Strain screw interchanges across all K Frame square butt models regardless of caliber. This is an old-style part — verify your revolver uses the old-style configuration before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":41254944768058,"sku":"173G","price":5.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/DSC00515.jpg?v=1771525927","url":"https:\/\/usagunsandgear.com\/products\/sw-k-frame-strain-screw-square-butt-blue-steel-old-style-used-173g","provider":"USA Guns And Gear","version":"1.0","type":"link"}