If you are looking for a more realistic look, these metal birdcage style flash hiders are great. They will fit most guns with a 14mm negative thread (which is the majority of airsoft guns). Do note, removing your orange tip in most cases will void you warranty.
IF YOUR ORANGE TIP IS REMOVED, ALWAYS TRANSPORT YOUR AIRSOFT GUN IN A GUN BAG OR IN IT'S ORIGINAL BOX. NEVER, EVER DISPLAY OR CARRY IT IN THE VIEW OF THE PUBLIC.