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If you're talking about the "MOS" That stands for "Modular Optics System". That means that this model has a slide that is cut to accept a Red/green dot optic.

Hi Donald and welcome. MOS = Modular Optics System to accept Red Dot Optics and Agoge is just a name for the Green Colored Shide coating and the Cobalt frame color. Cheers and stay safe!