Smith & Wesson N Frame Model 1917 Strain Screw Square Butt .45 ACP — Used Part 1917174B trigger return Factory new Smith & Wesson

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Smith & Wesson N Frame Model 1917 Strain Screw Square Butt .45 ACP — Used Part 1917174B trigger return Factory new Smith & WessonSmith & Wesson N Frame Model 1917 Strain Screw Square Butt, Used OEM Part Genuine used Smith & Wesson OEM strain screw for the N Frame Model 1917 revolver chambered in . 45 ACP (D. A. . 45). Square butt grip frame configuration. The strain screw threads into the bottom of the grip frame and tensions the mainspring, directly affecting trigger pull weight and hammer fall force. A rare and hard to find original factory part for this historic pre model