I generally am a total clean freak when it comes to my rifles. On these AR15 types, the curd that builds up in the flash hider/muzzle brake recess near the crown of the muzzle has always irked me. I am in the process of "refining" my setup and removed the muzzle brake. There was quite a bid of carbon that had built up between the end of the barrel (crown) and the inside face of the brake. I would think after a while this would have an adverse effect on the accuracy, but I have not seen any change.
I don't want to get anal about cleaning out this recess. Should this build up just be ignored???