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M-LOK is a modular locking accessory mounting system that is a direct attachment method for hard mounting accessories to a negative space mounting point. Ghost Ring is a type of Circular Rear Sight as pictured here : https://www.google.com/search?q=ruger+pc9+ghost+ring+sight&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi2nPbUms_kAhVDRqwKHT87CksQ_AUIEigC&biw=1280&bih=596#imgrc=wXGSIGRa_GzKZM:

M lok is the slots on the barrel shroud you bolt on M lok adapters to fit whatever attachment you want M-LOK, stands for Modular Lock, is a free licensed firearm rail interface system patented by Magpul Industries, developed by the Magpul The ghost ring is the type of sight The ghost ring sight is considered by some to be the fastest type of aperture sight It is fairly accurate, easy to use, and obscures the target less than nearly all other non-optical sights. Because of this, ghost ring sights are commonly installed on riot and combat shotguns and customized handguns, and they are also gaining ground as a backup sighting system on rifles. The ghost ring is a fairly recent innovation, and differs from traditional aperture sights in the extreme thinness of the rear ring, and the slightly thicker front sight. The thin ring minimizes the occlusion of the target, while the thicker front post makes it easy to find quickly.