Well lets take a look on what i have to tip you guys about. On the wcs server there is one races witch can be tricky to spot. TrickStar Assasin.
What you can do when you see alot of Barrels. and you know that your enemy is inside it. look for a gun sticking out of the "barrel". like Ak-47 and the M4A1. It will help you finde your enemy.
also, when you use trickstar assasin and you know your gun is pointing out of your "cover", try switch to the knife. it wont stick out of the barrel.