Advanced Combat Optical Gunsight (ACOG), and M68 CCO. Advanced Combat Optical Gunsight (abbreviated ACOG) is a series of telescopic sights manufactured by Trijicon. Aiming was through a standard GM.II reflector gunsight. For aiming, the cockpit included the new Revi 3B reflector gunsight. III reflector gunsight, which projected the sighting graticule directly onto the windscreen, or the Mk. The guns were fitted with a rear calibrated gunsight and an elevating screw. He was provided with a Mk 6 lead-computing gyro gunsight. A gyro gunsight for weapon-aiming purposes is typically present in the forward position only. They are also referred to as collimating sights or "occluded eye gunsight" (OEG). The standard GM2 reflector gunsight was introduced in mid-1939, although many Hurricanes retained the "bead". Other technological advantages included the radar-ranging gunsight and hydraulic controls. A similar device is the Advanced Combat Optical Gunsight. A computing gunsight and gun camera were added. Projected export version based on a F-104G with simplified equipment and optical gunsight. The E-1 was also fitted with the Reflexvisier "Revi" gunsight.