I have a commercial Blued Browning H.P. that has dovetailed, "drift adjustable" front and rear sights. It shoots about four inches to the left at fifty feet (my standard target distance). I have tried drifting the rear with a brass punch and small ball pein hammer and when it would not budge, tried the front sight with no more success than I had with the rear. What gives? Did Browning loctite those dovetailed sights or what?