Sentry gun

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The Engineer with a Level 3 Sentry
How am I going to stop some big mean mother hubbard from tearing me a structurally superfluous new behind? The answer: use a gun. And if that don't work... use more gun.
The Engineer


The Sentry gun (sometimes known as a "turret", "sentry" or "SG" ) is an automated turret which will fire upon any enemy who walks into its line of sight. The Sentry Gun will always target and fix on the closest enemy player. If an enemy Engineer manages to construct a building, for example a Teleporter, provided that it is within firing range and in the line of sight of the sentry (not behind a wall, etc.), the sentry will also shoot at the enemy building until it is destroyed.

It is one type of building that can be constructed by the Engineer, costing 130 Metal to place, 200 Metal to upgrade to level two, and an additional 200 to upgrade to the third and final level. With each upgrade level the sentry becomes more powerful, gaining machine guns, rockets and the ability to take more damage. The line of sight remains constant regardless of level.

When placing a sentry, the limit of its range is represented by a 3D sphere in your team color. A sentry that is being constructed will have its health increase gradually until it reaches its maximum health upon completion. The Sentry rotates 90 degrees to patrol the area, but is capable of rotating 360 degrees to lock on to a target. This takes a brief moment however, which may allow faster foes to slip past its range. The Sentry can also be manually rotated to face a different direction before you build it: When the blueprint is shown, using the alternate attack button (default key: MOUSE2) will rotate the blueprints clockwise by 90 degrees.

Sentry guns will not fire upon enemy Spies if they are cloaked or Disguised. Sentry guns are also unable to fire if an enemy Spy attaches an Electro sapper to it or while they are being upgraded/built. A destroyed Sentry gun leaves 60 Metal worth of pieces, which can also be picked up by other classes as Ammo.

Engineers can receive a "Sentry Gunner" achievement for racking up 10 kills with a single Sentry gun; the Engineer can die, as long as the Sentry Gun does not.

Unlike most other weapons, the sentry gun's weapons do not get affected with damage falloff from range.

It is possible to make the sentry gun do Mini crit if its target is coated in Jarate or if the Engineer who built the sentry is close to a Soldier with an active Buff Banner. This boosts the damage of each bullet to 22.

Sentry Gun Levels

Level Health Cost Weapon Damage Ammo
1

Image:Lvl1sentry.png

150 130 Metal Semi-Automatic Firing Barrel 14-18 damage
4 shots per second
64 average DPS
100 bullets
2

Image:Lvl2sentry.png

180 330 Metal Dual Rotational Minigun Barrels 14-18 damage
8 shots per second
128 average DPS
120 bullets
3

Image:Lvl3sentry.png

216 530 Metal
  • Dual Rotational Minigun Barrels
  • Target Guided Rocket Launch Support System
  • 14-18 damage (bullets), 8 shots per second for 128 average DPS
  • Rockets fire every 3 seconds doing 100 damage on direct hit
  • 144 Bullets
  • 20 rocket salvos

Trivia

Modifying your Sentry
  • A label on the Sentry Gun blueprint (right) reads, "Automatic Sentry Aperatus;" however, the Sentry gun manual refers to it as a "Sentry Mechanical Firing Device".[1]
  • Sentry Guns cannot fire through a Dispenser built by an engineer of the same team.
  • When out of ammunition, a Sentry Gun will lock on to enemies and attempt to fire, but will only make a clicking noise.
  • Engineers can climb higher with a level 1 Sentry Gun than with a dispenser (which can be useful on jump and puzzle maps).
  • The rockets from a Sentry Gun may sometimes damage teammates.
  • The Engineer apparently designed and built the sentry gun under contract from 'TF Industries' in 1965.
  • When sped up 200%, the sound of a level 1 sentry firing almost perfectly resembles the .30 Caliber Browning machine gun from Call of Duty 2.
  • If you are a Spy, and you disguise while being fired at by an empty sentry gun, it will continue to fire at you until you move out of its sight or cloak.
  • The Sentry gun makes a number of beeps every time it reverses its rotation. The number of beeps corresponds to its upgrade level, where a level-3 turret makes three quick beeps. The higher level the sentry, the louder they are as well, so a level 1 sentry is slightly harder to hear than a level 3 sentry, this can often be used tactically.
  • If the sentry has spent ammo (even if it's empty) and is at 175/200 upgrade the next wrench swing will upgrade the sentry and totally restock the sentry's ammo - all for only 25 metal.
  • The Official Game Manual is actually a Sentry Gun Operating Manual.

See also


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