Ever watch any of the old news clips from back during the war in Iraq??? Remember how all the soldiers had the butt of their M-4 sitting on top of their shoulder and the gun almost turned sideways when it showed them entering a building to do a sweep and clear??? That is because the Trijicon ACOG has about 1/4" of eye relief{no B.S.} They had to hold the gun that way to get the scope close enough to their eye to see through it!!!
Neat scope, I had one with the red chevron...it was bright and clear and it stayed zeroed good, but that way too little eye relief kills it.
One other thing about that scope...when you go to sight it in read the instruction manual carefully...it says to make your corrections on the turret and then bang on the side of the scope with a piece of wood or plastic mallet/plastic screwdriver handle to "set" the adjustment. If you don't whack it a few times the reticle wont move no matter how much you screw on the turret.
Bottom line...do yourself a favor, buy something else!!!!! Especially for the money.
In all fairness, I did see a new one the other day that seemed to have better eye relief, better, but not much.