Just put an ACOG TA11 on my 556 SWAT. It's the 3.5x version...soooo much better eye relief.

post a pic please. Interested in seeing the trijicon on the 556 platform.

I have a ACOG on my 556 classic its good!

I won't win an award for photography, but this will give you an idea of how it looks. Again, this is the TA11 3.5x model which is a bigger housing than the 4x version most people get. You give up a small amount of fov but make up for it in almost an inch more eye relief.

Nice!
I too prefer an ACOG. This is the 3.5x (battery powered) TRITA110C100492
I'm going to try a 5x prism optic on another AR when they are restocked but the ACOG is the top dog for sure.