Modular Optic Program (MOS): The MOS style and design on this pistol can be a match-changer. It allows for quick installation of various crimson dot optics, enabling shooters to reinforce their accuracy and goal acquisition. The product G17L Gen5 options MOS know-how, enabling easy mounting of optical sights for more https://glockstore.net/product-category/glock-17-for-sale/