Mossberg 500A

The Mossberg 500A is a shotgun that appears in BlastGen, and only appears in the Campaign and Multiplayer, but only makes a visual appearance in Zombies.

Campaign
The Mossberg 500 is a shotgun commonly used by allies. Sometimes, a Mossberg 500 may be found with a Reflex Sight and Foregrip, which is impossible in Multiplayer. It is a powerful weapon, being able to one shot kill most enemies except armored enemies. However, it is never used as a starting weapon, and most USMC soldiers in all levels have plot armor, making the Mossberg 500 harder to find.

Multiplayer
It is unlocked at Rank 8, and is the second shotgun unlocked. The Mossberg 500A fulfills its role as a well rounded, pump action shotgun. The Mossberg 500A, like all shotguns, fires 8 pellets per shot, with each pellet dealing 45 damage, requiring 4 of the pellets to hit the enemy to secure a kill. It is much more powerful than the Double-Barrel, which is unlocked much earlier, and unlike the latter, the Mossberg 500A has actual iron sights, while the Double-Barrel does not. The Mossberg 500A is a popular shotgun in BlastGen, and is favored more than the other two shotguns.

Zombies
While not usable in the mode, a Mossberg 500 shotgun with wooden furniture can be seen leaning against a desk in the map Hotel. However, it is unusable, and was presumably replaced by the Remington 870.