Integral Red Dot Sight Mounting Slot, Plus a Ton of Custom Features! The limited production Brownells Brown RMR Slide for Glock 20 Gen3 pistols features a pre-cut slot for easy, secure, low-profile mounting of a Trijicon RMR or Holosun red dot sight. Up front, there are distinctive, cocking serrations that aid in manipulating the slide to check the chamber or clear a jam. And we'll admit it: the serrations just look cool, too. All RMR Slides also have standard Glock factory front and rear sight dovetails for "iron" sights. To get proper co-witnessing with the RMR, you will need to also install suppressor-height iron sights. A Brownells RMR Slide is th Mfg: Brownells
