The newer Eotech gun sights are all being made with the power buttons on the left side and not in the back.  If you have the older models, you’ll probable have some issues like I did with the Eotech Magnifiers.   I had to leave a bit of a gap between mine just so I would be able to get  my hands in between them to turn it off and on.  The way my present M4 Carbine setup is, I can still use the older models, but It should does make it easier to just use your left hand them (if you are right handed) to turn the power up and down.   The magnifiers really make a difference, but its one of those never ending responses  I get about “Couldn’t I just have got an ACOG for that price?”

Sure you could, but you’ll have a lot of trouble using a Trijicon ACOG in short ranges.   If you look at the ranges most engagements take place in, there is almost no need for magnification.   A few friends of mine that were in Iraq said the Trijicon ACOGS they had came in real handy to spot wires from roadside bombs.   The Eotech sights you the widest field of view of any optic I know of and that makes rapid engagements of multiple targets very easy and fast.  Getting the first hits in is more important that how tight your groups were.