Works, but a lot of work - LPA SPR Adjustable Fiber Optic Sight Set

For a Ruger P94, the rear sight needed a lot of filing to fit. Not only of the dovetail, but also the bottom surface at the front of the sight in order to clear the little ridge that the P94 has along the top of the slide. Also, the sight has two set screws, but on the P94 only the left one can be used. If the right one is tightened down, it interferes with the firing pin safety block. I put lock-tite on it and left it flush with the bottom of the sight.
The front sight is nicely visible. When installing it, I used the "drill halfway from both sides" method. In order to minimize widening the holes on the frame, insert your drill bit as far as you can into the chuck to minimize wobble and flex as you drill the sight.
Once installed, all worked well. The plain black rear sight has good contrast with the bright front fiber optic.