1.【4x RED/GREEN RETICLES(Circle Dot, Cross, 10 MOA and 3 MOA)】With four reticle patterns illuminated in red or green, this reflex scope offers a total of 8 different sighting options and 5 brightness levels to toggle between. 2.【PICATINNY/WEAVER MOUNT】Built-in scope mount base for ...
This is a cut in the slide that accepts plates which are used to mount the optics. Different pistol optics have different mounting systems. Glock ships the gun with a variety of plates for most of the optics patterns on the market. It can get confusing though. They have it covered in th...