The killstreaks rewards that have been mainstays in multiplayer have made their way into the Zombies mode for Call of Duty: Modern Warfare 3. Players can use a few of the killstreaks, such as the Sentry Gun, but it may not be as easy to get.
How to Find a Sentry Gun in MW3 Zombies
There are two methods on obtaining a Sentry Gun in the Modern Warfare 3 Zombies mode: getting it randomly in the environment or purchasing it from the Buy Station. The first method can occur, but the chances can be slim.