My pristine 686 no dash w/6" barrel has a problem. Just bought it used and found when firing all rounds from sandbags at 25' all are at least 4" low. 38spl n 357 mag both low. Rear sight is at its highest elevation. Hooked up my bore sight n sure enough...very low! Front sight is pinned so no adjustment there. Could it be it has the wrong rear sight? White outline with elevation and windage adjustments. See other rear sights are avail for 686 no dash 1982 models.....160"and .146" and one more. Think mine is .146 but not sure. Any help on my rear sight to get me on target?
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