SCAR-type 3-prong flash hiders look pretty aggressive and are threaded for quick detach suppressors. Maybe look into one of those?
You can typically get them packaged with a suppressor, allowing you to swap a longer inner barrel for outdoor, and the stock one for CQB play if you desire. I have seen them sold on their own though if you just want the look.
Sometimes and understated 'practical' look can be nice too though, especially on otherwise tac'd-out guns.
Buy what you like (but not a Barrett .50 muzzle break unless you like lame puns and want to make the airsoft equivalent of one)!