The BAR (Browning Automatic Rifle) is an American machine gun featured in all Zombies maps of Call of Duty: World at War and the revised World at War maps in Call of Duty: Black Ops.
The BAR can be bought off the wall, obtained via the Mystery Box, and Console Commands. It has a slow rate of fire, moderate to high power, and little recoil. It is best for going for headshots in the mid rounds, due to its power decreasing as the zombies' health increasing. However, due to its slow rate of fire, players tend to trade it. This can last up to about round 15 without being Pack-a-Punched.
The Pack-a-Punched BAR becomes "'The Widowmake'r," possessing higher damage and more ammunition per magazine and held ammunition. Like most other Pack-a-Punched weapons, it retains most of its traits, thus becoming useless after more than ten rounds. The Widowmaker will start to lose power about round 25 to 30.