AA-12

The AA-12 is an American-manufactured shotgun in the non-canonical Nazi Zombies storylines Apocalypse II: Left Behind and Origins.

Apocalypse II: Left Behind
The AA-12 in the Apocalypse II: Left Behind storyline is fully automatic, which makes it unique. The AA-12 first appears in That's No Sandstorm, and from then on appears in every mission. This shotgun has a very high rate of fire, medium penetration, and medium-high damage. It can only be obtained from the Mystery Box. When Pack-a-Punched, the AA-12 becomes the "BB-24", which is a play-on of its original name.

Origins
The AA-12 in the Origins storyline is also fully automatic. The AA-12 makes its first appearance in Arrival, and appears in every mission from then on. The stats of the AA-12 are exactly the same as the stats from the Apocalypse II: Left Behind storyline. It can only be obtained from the Mystery Box. When Pack-a-Punched, the AA-12 becomes "The Awesome Shotgun". After the upgrade it has a twenty round magazine, ACOG Scope, increased range, and more power.