I use the PWS FSC556 and its little brother, the TTO, as well as various flash hiders, and i like the TTO by far the best because it makes it so easy to fire rapidly and stay perfectly on target, and unless you have a good excuse as to why you dont want someone to see your muzzle flash, like being in firefights all the time, then who cares about muzzle flash, and there's almost no reason to be shooting without ear pro, at least at length, so the additional noise created by a comp shouldn't really matter.