In addition to rails that mount under the gun, You can also find choices for rails that will permit the mounting of sights and optics. There's the WOR4 Tac Rail that mounts on the front from the gun and produces a rail that goes over the top in the slide. https://beretta92threadedbarrelfo91002.ziblogs.com/26984531/details-fiction-and-beretta-92-extended-barrel