I have a Smith and Wesson M&P where the regular barrel was swapped out for a 2" barrel from apparantly a Model 10. My problem is that the width of the front sight is wider than that of the rear sight. Is it possible to switch the rear sights? Is it realistic when compared to widening that which is currently on the pistol? All of this is assuming that it is done by a competent gunsmith. thanks for listening!