Second, that's not an ACOG. It's a Trijicon Reflex. No ACOG. I know that's being nitpicky, but that's just me.
Well, the Trijicon Reflex sights do say "ACOG" on them, so you might cut the guy some slack. Look at the "top view" in the following link.
http://www.bhphotovideo.com/bnh/con...ail&A=showMultipleImages&Q=&sku=551645&is=REG