How do you change gun sights on a S and W model 5906?

To change the gun sights on a Smith & Wesson Model 5906, first ensure the firearm is unloaded and safe to handle. Use a sight pusher tool or a brass punch and a hammer to gently tap the old sights out of their dovetails; take care not to damage the slide. Align the new sights in the dovetail slots, ensuring they are properly oriented, and secure them in place by tapping them in with the tool or punch. Finally, check the alignment and make any necessary adjustments before testing the accuracy at the range.