Modular Optic System (MOS): The MOS design on this pistol is usually a match-changer. It allows for easy installation of assorted crimson dot optics, enabling shooters to reinforce their precision and focus on acquisition. ) They were Excellent, Specially at dusk and nighttime. In spite of my shade blindness, I'd https://deankmpon.bloguetechno.com/glock-17-mos-for-sale-an-overview-66006569