J190637 Smith & Wesson J Frame Model 637 Revolver Part Used Trigger Assembly .31 .308 Winchester Bronze Bore Brush —

Bronze Bore Brush —

Look behind the yoke on the frame for the model number

While the finish is blue steel

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J190637 Smith & Wesson J Frame Model 637 Revolver Part Used Trigger Assembly .31 .308 Winchester Bronze Bore Brush —J190637 Smith & Wesson J Frame Model 637 Revolver Part Used Trigger Assembly . 312" Please call or email with any questions! How to determine the model number of your Smith & Wesson Revolver. Swing out the cylinder , check behind the yoke on the frame for a MODEL NUMBER. Model numbers began in 1957 58. So if there is no model number then your revolver may be older than 1957 58. In this case we can possibly still find the part you need with the serial