SJ - Based on extensive conversations with TR, a lengthy discussion with the manager of Trijicon's Military/Fed LEO Sales Division and my intended use, I'm looking at a TA11 probably with the chevron. My only real experience with the ACOG has been limited to the TA01NSN and fondling other people's toys. I had my initial doubts but the experts have convinced me. Bottom line - I'm planning on putting it on an FN and I need the eye relief. The rifle is large enough that the size of the optic is not an issue. Everything else meets the requirement perfectly. The BAC isn't a big deal. It's really not that different from using a red dot sight with both eyes open (something I think you should be doing anyway). I'm looking forward to putting together this rifle/optic combo - ought to make an incredible truck gun!
FWIW - Peregrino