Some info to keep in mind when ordering a S&W sight.
First, you have to order a sight with a blade intended for that specific model and barrel length.
As example, the Model 686 2 /12" barrel uses a different sight blade than a 686 6".
Second, there are the old style sights, and the new style. These WILL NOT interchange on the frame. You have to order the correct model for your 686.
Prices: Brownell's sell the old or new model sight assembly for $$47.00 to 54.00.
Again BE SURE about whether you need the old or new style, and the barrel length before ordering.