Reflective optics for artillery have been around since before World War One. With the massive rounds of the Great War, it makes sense - who would want to put their eye next to a scope ocular on a rifle with enough recoil to give shooters a black eye? At first, these ambient light and half-mirror, "powered" reflex sights were confined to artillery and aircraft. They were simply too bulky and too daylight-dependent for small arms use. After World War Two, reflective optics were offered for sporting guns but were not considered suitable for individual military weapons.