Looks great, Matt.
Normally, I poo poo at the use of extra-long flash hiders to compensate for lack of stamp. Not this time. The CAR-15 already had a long flash hider, so a little more doesn't hurt it, and the little bit of extra barrel between the FSB and FH doesn't look out of place. You've got a 16" gun disguised as an SBR. I'm loving it!