In Hollywoodland, all automatic firearms benefit from the Law of Inverse Recoil and function solely on the premise of "Spray a lot of bullets on full auto and at least some of them will hit something", and not "I should actually aim at whatever I'm shooting at so I can hit it and take it down in the least amount of shots possible". Therefore, fictional guns don't bother with gun sights of any kind, since nobody really uses them anyways. A Hand Wave common in SF settings is that some sort of HUD allows the shooter to aim without actually lining up a bead. See also A-Team Firing.