This will allow you to mount your Leupold Delta Point Pro directly to your Sig P320 slide. This will leave the rear dovetail, so you can can cowitness iron sights, but the DPP is relatively tall and the P320 slide does not allow us to machine very deep. As such, the top of the red dot base sits .374" above the top of the slide, so you will need sights at least that tall to see them through the red dot. At this point, only possible recommendations are the Dawson .400 - .450" tall sights. Holes will be cut M4-0.7 for the screws which come with your red dot, should fit without modification.