What is mos in glock?

MOS in Glock stands for Modular Optic System. It is a feature that allows users to easily mount different types of sights and optics onto their Glock handguns without the need for permanent modifications. The MOS system consists of a set of adapter plates that can be easily removed and replaced to accommodate different types of sights. This feature is particularly useful for shooters who want to customize their firearm with precision sights or attach a red dot sight for faster target acquisition. The MOS system is available on a variety of Glock models, including the G17, G19, G34, and G41.