This will allow you to mount your Trijicon RMR red dot directly to your Sig P320 slide. It will leave your rear dovetail untouched, so you can cowitness with iron sights if you want. The distance from the top of the red dot base to the top of the slide is .210", so any iron sight taller than that will be visible through the red dot. Pictured are Trijicon's suppressor height Sig sights at .356" above the top of the slide. Holes will be cut 6-32 to fit the screws that come with your RMR, some minor fitting for length may be required if you install the red dot yourself.