Best non-milling way to mount an optic
I don't have this product, but noticed the description is leaving out some major points. You need to run BUIS on a pistol with an optic because as you draw your eyes naturally line up the iron sights, and when the red dot appears in the sight window you naturally transition to that. Without irons, you spend 1-3 seconds searching for the dot because there's no way to perfectly line the gun up and lose all the benefits of having an RDS on a pistol. BUIS ARE ABSOLUTELY NECESSARY IF ADDING AN OPTIC TO A HANDGUN. So if you can't afford or don't want to mill your slide to fit an RDS, this is the next best thing. I will add that having the sight that much higher over the bore does mess you up a bit, but it's far better than running without irons.