they are pinned on,then smoothed and blued,removing them can be very difficult. Ive saw a couple that they removed the front band by sawing it in half.I even had 1 for a while that had the matching front band with it,split along the top with a hack saw. try sliding a known same series band on to it,if it doesnt fit, then removing the sight is about the only option,and since the band were number and proof mated to the gun your putting a lot of work into a mis match rifle if you go that route.it may be simpler and possible to remove enough metal from the interior of the new band to get it over the sight ears.