The M68 is a type of optical sight used primarily on military firearms, particularly the M16 and M4 rifles. It is designed to provide quick target acquisition and improved accuracy in various lighting conditions. The sight features a red dot reticle, allowing shooters to aim more effectively without the need for precise alignment. This sight is part of a family of reflex sights, which are known for their ease of use and rapid target engagement. The M68 is often used by military personnel and law enforcement agencies, enhancing their operational effectiveness in the field.