The Reflex Sight is a non-magnifying "electronic sight" that uses focusing optics to show a reticle floating out in front of the weapon. It depicted as a old style "tube" Red Dot Sight with the name "ArmPoint Mark ll Red Dot" on the side. It features a customizable reticle like other Red Dot Sights in the game. The Reflex Sight is available on most Assault Rifles, SMGs, and LMGs.
The differences between the Reflex and other Red Dot Sights are purely aesthetic. Compared to other Red Dot sights, the Reflex Sight has a slightly larger optical window, allowing for better vision around the reticle. However, the tubed casing for this early Red Dot Sight is rather bulky compared to modern simple open Red Dot Sights, and thus isn't as commonly used as its counterparts.