Not a huge fan of Acogs here. I used the TA31RCOM4, TA31RCOA4, and whatever variant of the TA11 that the USMC fields. Also got some time behind the 6x version on our M240's. Saw enough of them break, lose zero, not track, etc... that I'm leery of them. It may be the case that the USMC just abuses them but there's a definite weakness in the turret design from my experience. I don't care to get into an internet pissing match over it, I'm sure if you've bought one yours works just great.
If you're ready to spend $1200+ on a fixed 4x.... Personally I'd be looking more to a 1-4x or a 1-6x.