Sights don't fit - Strike Industries ARK Pistol Slide for Glock

It took several months to get all the parts together for this build. I finally assembled all the interals, barrel and recoil unit, put it on a functioning frame and it works and looks great. Then came sight installation. First the installation tool i have would not work because the rear sight hung out way too far. So I tried tapping it into the dovetail a little, but it wouldn't move. I then removed the sight and measured the rear sight dovetail cut in the slide. It is about .014 too narrow for the Night Fision sight set that I had bought. ☹ So now I have to either hunt down a rear sight that will fit(most websites do not list detailed product dimensions), or have the slide machined out. Dissapointment is something of a regularity now with part compatibility.