Great question Daniel, It's sort of a matter of preference especially for airsoft. Few things to consider however, the receiver is the best place to mount it over the rail because it is fixed to the gun and will not move, flex or spin. Next thing to consider is what you are seeing. Since red dots have no eye relief problems you can mount it whenever you want without having to worry about eyeboxes or focus. That being said, if you do move the optic close, you will see more of your field of view through the optic but less around the optic, if you move it further you will have less field of view through the optic but more around the optic. It really depends on what you prioritize, I like to use the dot as a reference point but like to keep good peripheral vision. As well, sometimes you will need to bring the gun over your shoulder to fire in strange spots, having the red dot further forward allows me to move my face into the gun when I need to do something like this. Personally, I (the guy in the vid) likes to mount it at the end of the upper receiver because it's the most comfortable considering all these factors.

I mean, it's not a problem really since you shoot with both eyes open.

At least from what I've heard it's generally best to use a grip as a hand stop

I'd love to see what someone worthy of your respect looks like. Cleary beyond my mortal levels of comprehension.

@@ilovethefederalgovernment I never said I didn't respect this I was just picturing those call of duty players that spend every moment of the day playing cod playing airsoft instead. Basically playing only to win instead of having fun

But winning is the most fun.

@@scourge18a not to all of us

The difference is that things you learn in airsoft (as well as the physical activity from it) actually have real-world applications. COD does not.