Dueck Defense just introduced the Red Dot Back Up or RBU. The RBU is a red dot mount for handguns that has integrated back up sights. The sights serve to help you find the dot when you present the pistol and as a back up sighting method should the dot sight fail.
The RBU is designed to mount the Trijicon RMR to Glock handguns without modification using the factory rear sight dovetail. The sights are high enough to clear a suppressor. The RBU is machined from steel barstock and nitride processed for corrosion resistance.