I recently decided to swap out the stock A2 on my 6920 in favor of a different muzzle device and when I got the A2 off and inspected it, it was absolutely disgusting on the inside! There was all kinds of gunk, carbon and even copper jacket fragments inside the FH.
All that crap couldn't be good for consistent accuracy. So I'm wondering how often should one remove the muzzle device for inspection and cleaning?

