The A2 birdcage stlye is a good flash hider on 14.5" plus barrel lengths. On a 10.5 you will be getting a ton of noise/concussive shockwave and flash. Shoot it some, and if its really annoying, then swapping muzzle devices can make it much more shooter friendly.It's a 10.5" barrel, so I'll leave the pistol brace on there to stay legal. I haven't got to shoot it yet, but hopefully in the next couple of weekends I'll get out to the range with it.
I'm relatively new to ARs, what makes you say that about the flash suppressor on mine? Is it a bad design?