-The longer you hold the primary fire button, the more damage your shot does.

-Headshots do count. A fully charged headshot can kill any class.

-If you see a little red dot all of a sudden on your face, duck. They are aiming for your head an it will look like you dodge bullets.

-Hide your dot. If the ememy know they will be sniped, they might choose a different path or try to dodge your shots. Instead, charge your rifle off on a wall that is facing you, so approaching people won't see it.

-The auto rifle is surprisingly accurate and powerful. If someone is approaching and you screwed yourself by missing that charged shot, quickly switch to you auto rifle and see what you can do.

-If one of your bullets didn't kill a guy, chances are they are about to die. Toss a grenade in their direction and the splash damage might take care of them.