Sentry Guns are essential in MW3 Zombies for a variety of uses, including glitch exploits and aiding in challenges and battles against special enemies.
The primary places to find Sentry Guns are at Buy Stations and as random rewards from Mercenary Caches.
Medium Threat Buy Stations (MT-BS) are the most reliable method of acquiring Sentry Guns, offering a guaranteed purchase for 2000 Aether.
Completing contracts that award 2k Aether is an efficient way to fund the purchase of Sentry Guns from Medium Threat Buy Stations.
Mercenary Caches, located in various areas of the map, provide a random method of obtaining Sentry Guns by completing challenges.
Mercenary Cache loot boxes contain various items, including Sentry Guns, Ammo Mods, Perks, Weapons, and Killstreaks.
Sentry Guns are classified as blue quality items, which allows them to appear in low threat areas, increasing the chance of encountering them.
Random encounters through mercenary caches are less reliable for consistent Sentry Gun acquisition due to unpredictable loot tables.
The most efficient strategy is to visit Medium Threat Buy Stations when in need of a Sentry Gun to ensure a timely and reliable purchase.