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No optics ready slides will have "MOS" (modular optics system) designation. This is a standard version. You can have the Slide milled for an optic by many after market companies id recommend Jagerworks as they are agreat balance of affordable and high quality. https://jagerwerks.com/trijicon-rmr-for-glock/ ------------------- Or for a lower cost but less reliable option you can get a dovetail mount https://www.glockstore.com/Micro-Dot-RMR-Dovetail-Mount ------------- The dovetail mount are much more prone to break and or lose zero, not recommended for a defensive/CCW/Duty weapon really only good for a range toy.

Derek, no Sir, not from the factory. You can have the slide milled for red dots by Milling Services : https://wepleadthe2nd.com/slide-milling/

No, this not an MOS model.