This is a Trijicon RMR with all original box, books, cover, mounts, screws etc. This is ready to go on any pistol cut for the RMR footprint. It also includes the Trijicon brand mount for using this on an AR15 height rifle. Mount alone is sold by Trijicon for over 100. Functions perfectly, self dimming and brightening dot intensity. This is the top of the micro red dots. It's the one all the others are compared to and measured against.