I shot the following from a rest back in April (gun #2). The rear sight was BOTTOMED OUT. POI for all loads was dead center. Was looking to see POI diffs w/different loads. I always shoot lower from a bagged rest and other folks will shoot differently. My front sight is right at .280" and the rear is .146 (If i measured correctly).
I ordered (and finally received) two .126 rear sight blades from S&W -- S&W parts are way backordered.
Also ordered two front sight blades from Dawson Prec (above link) -- both .10" wide and one .305" Hi and one .320" high.
I also ordered a Bowen Rough Country complete rear sight assembly (also backordered) -- the the Bowen blade is equiv to S&W's .126".
I'll get something to work to my satisfaction eventually.
I did email S&W customer service about the sight regulation problem. All I wanted was a taller front sight or a shorter rear. They insisted I send the gun to them, so I went the above routed in stead.
FWIW,
Paul