FP-45 Liberator

The FP-45 Liberator is a very crude handgun designed by the United States to be mass-airdropped into hostile-occupied territories during the Second World War.

In Call of Duty: World At War
The Liberator appears in the Insurgency game mode as the only gun immediately availible to the players. It has a one-round capacity and has 9 spare rounds. It suffers from a very low penetration value and the harshest damage penalty over range in the entire game, being a one-hit kill at eight metres maximum unless the player scores a headshot. While the player can sight with the Liberator, its sights are crude and inaccurate at best, and should not be relied upon for any reason. It is certainly a compeditor for the dubious honour of the worst gun in the entire Call of Duty series, and should be used only if there are no other options availible.

In Fan Fiction
The Liberator has yet to make an appearance in any fan fiction, however this may change.

Trivia

 * The Liberator has the lowest ammo capacity in the entire Call of Duty series. Along with the least carried ammo.