Sentry Bot (Fallout 3)

The Sentry Bot (military serial numbers SB-XXXX) is a military robot model made before the Great War. A different Sentry Bot model was used in military bases in California, while this one has been seen mainly in the Capital Wasteland. They have two arms that end with deadly weapons (a Minigun or Gatling Laser and a Missile Launcher), and three legs that end with wheels.

Sentry Bots are extremely heavily armored and take significant amounts of small arms or energy weapons fire, or even multiple missile shots, to destroy. Their durability in on par with a Deathclaw or Fawkes. Unlike Deathclaws, Sentry Bots lack a "weak point" that can be shot for extra damage. They do not take additional damage from headshots, and in fact take less damage when shot in the head or legs than when simply shot in the torso.

Sentry Bots are programmed with the most professional, "robotic" personalities of the game's combat robots. Unlike the hapless Protectrons, pleasant Robobrains, or gung-ho Mr. Gutsies, Sentry Bots speak in a deep, authoritative robotic voice, and simply call out combat information such as "acquiring target" or "proceeding with target elimination".

Sentry Bots are the highest level robot NPCs in Fallout 3, and are much more powerful opponents than Protectrons, Robobrains, and Mr. Gutsys.

Appearances
This sentry bot model appears only in Fallout 3. A similar robot appears in Fallout 2 also armed with minigun and missiles, however with different design.

Tactics

 * One quick way to get past these metal hulks is to throw a pulse grenade at them which temporarily disables the robot (though sometimes it seems to make the robot go faster). With this window of opportunity, unload on the robot without fear of reprisal.
 * Cripple its missile launcher arm then fire from a distance.
 * Cripple the minigun arm and attack up close.
 * Shooting them in either arm seems to do more damage than anywhere else.
 * When facing a solitary Sentry Bot, the combination of its slow movement and charge up time of its gatling lasers/minigun makes it possible for you to circle strafe around it without it being able to fire any shots at you.
 * Sentry Bots have high resistance against fire based weapon such as Flamer. However, Shishkebab surprisingly deals incredible damage to Sentry Bots. But if you have your flamer pointed at the center or the head, excluding the VATS it will do more damage, if you have the Burnmaster, it will be more effective
 * Due to their innate ability to ignore enemy DR, Deathclaw Gauntlets are also an ideal weapon, and can destroy a Sentry Bot with just a few strikes.
 * Provided you can close distance, the best tactic is to use the Shishkebab or Deathclaw Gauntlet and strafe around it in a circle. Change directions from clockwise to counterclockwise to confuse it even more, and it will never fire a single shot.
 * When facing a Sentry Bot with conventional weaponry only, keep in mind that its weapons are mounted relatively low on its chassis and far from its center. This can allow you to make attacks on the Sentry´s body from above or from behind cover while blocking the Sentry´s line of fire.
 * Due to its slow movement speed, if you can get behind it you can melee it to your hearts content.
 * Players who possess a high enough critical strike chance, as well the Victory Rifle can easily take a sentry bot down without letting it fire a single shot, as critical strikes will cause a knockdown, but due to the sentry bots tripod design, they will often just be standing, allowing easy targeting of the hardpoints.