Zev Technologies mounted the new Leupold Deltapoint Pro red dot on one of their Glocks. Some pictures of the Deltapoint Pro show an optional integrated rear BUIS. Zev Tech has answered the question of “how does the rear sight fit and work when mounted on a pistol?”. It appears the whole slide is machined away. Of course with money you can customize anything to fit that optic. I am curious how the rear irons work on a pre-milled slide like the FNX-45 Tactical, M&P CORE, or the new optics ready Glocks coming out. Hopefully my questions will be answered next week at SHOT SHOW 2015.