Mounting red dot and reflex style back-up sights on the scope cap has become very popular for tactical and competitive shooters. The Geissele 45-degree scope mount for 34mm rings now gives you the option to use Geissele factory parts for your Geissele scope mount.
The Geissele Scope Cap Mount gives you the ability to mount a reflex/red-dot sight for quick target acquisition and engagement, as well as easier passive aiming when using night vision devices. Some users may also benefit from having an additional optic with an alternative zero based on ammunition selection. The 45-degree ring cap has a Picatinny rail top to mount the secondary optic of your choice, leaving a wide variety of possibilities. This puts an Aimpoint Red Dot or Trijicon RMR, at 1:30 in your view, for example.