OK, so TAM and Andy inspired me and I got my AAC flash hiders installed at McClelland Gun Shop,
http://www.mcclellandgun.com in Garland. They were super friendly and did a great job - also installed a clocked lantac dragon muzzle brake on my AR-10 (I recently installed the same brake on my 20" Rem 700 in .308 and it made a HUGE difference!).
I put an Elftmann in my Ar-10:
Here is my Colt M4 SBR with AAC suppressor, Timney Trigger, Aimpoint red dot, etc.,:
