{"product_id":"smith-wesson-model-27-strain-screw-square-butt-27173c","title":"Smith \u0026 Wesson N Frame Model 27 Strain Screw Square Butt Old Style 27173C","description":"\u003ch2\u003eSmith \u0026amp; Wesson N Frame Model 27 Strain Screw - Part 27173C\u003c\/h2\u003e\u003cp\u003eAuthentic Smith \u0026amp; Wesson old-style strain screw for N Frame Model 27 and Model 27-2 revolvers with square butt grip frames. This vintage OEM factory part controls mainspring tension, directly affecting trigger pull weight and hammer function for reliable performance.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVintage OEM Part:\u003c\/strong\u003e Genuine Smith \u0026amp; Wesson factory component manufactured to exact specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOld-Style Design:\u003c\/strong\u003e Period-correct strain screw for classic Model 27 revolvers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMainspring Tension Control:\u003c\/strong\u003e Regulates hammer spring pressure for consistent trigger pull and reliable ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquare Butt Configuration:\u003c\/strong\u003e Specifically designed for square butt grip frames\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed Condition:\u003c\/strong\u003e Functional vintage part showing normal wear consistent with previous use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Models\u003c\/h3\u003e\u003cp\u003eThis strain screw is designed specifically for Smith \u0026amp; Wesson N Frame revolvers with square butt grip frames:\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eN Frame Models (Square Butt, Old Style):\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eModel 27 - .357 Magnum (square butt variants)\u003c\/li\u003e\n\u003cli\u003eModel 27-2 - .357 Magnum (square butt variants)\u003c\/li\u003e\n\u003cli\u003eOther vintage N Frame models with square butt configuration requiring old-style strain screws\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHistorical Context:\u003c\/strong\u003e The Model 27 was Smith \u0026amp; Wesson's premium .357 Magnum revolver, introduced in 1935 as the Registered Magnum and later designated Model 27 in 1957. This old-style strain screw is correct for vintage production models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e This is an old-style strain screw for square butt models only. Not compatible with round butt models or newer production runs using updated strain screw designs. Verify your revolver's grip frame configuration and production era before ordering.\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003eProfessional gunsmith installation strongly recommended. Disassembly and reassembly of the revolver's internal action required. Some fitting may be necessary by a qualified gunsmith to ensure proper mainspring tension and trigger function.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 27173C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Smith \u0026amp; Wesson\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrame Type:\u003c\/strong\u003e N Frame\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrip Frame Type:\u003c\/strong\u003e Square Butt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Old Style (Vintage)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Caliber:\u003c\/strong\u003e .357 Magnum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1 oz\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003ePreserve the authenticity of your vintage Smith \u0026amp; Wesson Model 27 revolver with genuine OEM parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQuestions?\u003c\/strong\u003e Contact us at sales@usagunsandgear.com or call 770-544-8075 for technical support and compatibility verification.\u003c\/p\u003e","brand":"Smith and Wesson","offers":[{"title":"Default Title","offer_id":41135922085946,"sku":"27173C","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/DSCF0027_e84b55bc-9a53-4767-83a7-5a37485ffa92.jpg?v=1765822619","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-model-27-strain-screw-square-butt-27173c","provider":"USA Guns And Gear","version":"1.0","type":"link"}