a friend just bought a bretta 92/96 full size in 40s&w , it has night sights and the front sight is part of the slide , its a older cop gun, the gun shoots about 4 inches low! i looking for opionions on the best adj sight set up , even if the front sight has to milled off and a dovetail has to be cut the slide, the milling can also be done for the rear sight such as lo mount rear sight