In the 70’s the reflector or reflex sight or more commonly know as "red dot sight", came in to use. The benefit of this type of sight is that that gives the user a simple bright red dot as an aiming point. Some of the red dot sights have different brightness level's that you can set them at. The red dot is a l.e.d light powered by a small battery low energy requirements mean its possible for sights to last for 100’s of hours with out having to replace the batteries. Normally this type of sight/scope are not magnified. But a benefit of this is that Compared to telescopic sights, a red dot sight with no magnification can be held at a distance from the eye and at most angles, without distorting the image of the target. They are mostly used with both eyes open giving the shooter normal depth perception and full field of view. all of the sights below can be fitted to any bbguns or airsoft guns with a rail. they can also be used with air riffles and paint ball guns. one last thing some sights allow you to switch it from red to a green dot sight.