There is essentially no difference in the two, they both do the same thing but they look different on the outside. Technically speaking, a red-dot is a reflex sight.
Get a red dot sight or reflex sight and create the lens....
It isn't in MW3. It's basically a red dot sight with a customizable center dot.
A red dot sight or reflex sight is a common attachment that is sticky and mounted on top of a pistol to provide better aiming precision by projecting a red dot onto the target.
Properly called a reflex sight. See the link below for article explaining how they work.
The holographic sight is a sight with a 1.5x zoom. The hybrid sight is a combination of both the red dot sight and holographic sight, you can switch between the two at any time. The hybrid sight is only in MW3. Related links have been added that describe the features of both sights
With a red dot, or reflex sight, you have a low power LED that produces the reticle, while a holographic sight uses a more powerful laser that bounces around to produce the holographic image of the reticle. The biggest impact of this difference is the duration of the battery life of the site. As the holographic sight consumes more power, it understandably dies quicker compared to a red dot sight. It is always recommended to turn off your site if you do not intend to use it for some time to avoid draining the battery. You can get any other idea about holographic from online as Olomagic.com.
kaparis rapid fire you can put on a reflex or red dot sight for more acuracy
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To get a square, or any shaped sight, go to create a class > (choose custom) > primary > attachments > red dot or reflex sight > go back to primary page > reticle > scroll down until you find your shape.
The difference is that red-dot sights have contained aiming reticles, whereas laser sights use an emitted laser beam that must fall onto a target. Red-dot sights are used mainly for more accurate ADS (aiming down sight) firing and laser sights allow for less-accurate, but made more so, shoulder-firing.
You need to get reflex sight or red dot sight and get to a certain level (sorry I can't remember what level I think it's like 15) and go to reticle then choose what you want.
an electric sight is a "red dot" sight that uses a laser to project a red dot where the airsoft bbs will go when you sight it it.