I am personally a fan of the A2 style flashhider, and although I employ a muzzlebrake (Accubrake from Weatherby) on a .300 Weatherby Mag, I did not see a major improvement in accuracy for the bolt gun-it is so accurate out of the box it is not funny. I would think you were right-the .223/5.56mm round has virtually no real recoil to speak of, if you can have a flashhider and have the bottom slots left out, go for it. The real plus I might see with a muzzlebrake is for faster follow up shots. I have an Eagle flash-hider on this particular mini-14, and it compliments it nicely.
Ever see an A2 or M4 fire at night?
Ever see an A2 or M4 fire at night?