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 abbreviated to "SG") is a building that can be constructed by an Engineer and functions as an automated turret which fires upon any enemy who walks into its line of sight. The Sentry Gun will always target and fire on the closest enemy player or building, provided they are within firing range and in line of sight of the Sentry (not behind a wall, etc).

The Sentry Gun costs 130 Metal to build, 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 Gun becomes more powerful, gaining machine guns, rockets and the ability to take more damage. The firing range remains constant regardless of level.

The Sentry Gun's ammo may be replenished with your own metal by hitting it with your Wrench. Each bullet reloaded costs 1 metal and each rocket salvo costs 2 metal.

When placing a Sentry Gun, the limit of its range is represented by a 3D sphere of 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 fire button (default key: MOUSE2) will rotate the blueprints clockwise by 90 degrees.

Sentry Guns will not fire upon enemy Spies that 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.

Unlike most other weapons, the Sentry Gun's weapons do not get affected with damage falloff from range nor can it gain criticals. It is possible however, to make the Sentry Gun deal Mini crit attacks and damage 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, boosting the damage of each bullet to 22.

Since the Engineer Update, players are able to pick up and move their sentries around. The Sentry retains its level after being transported in the Toolbox.

Also included in the Engineer Update is an unlockable Pistol replacement, The Wrangler, which allows the Engineer to take direct control of his Sentry Gun by 'marking' targets manually. Doing so shuts down the Sentry's automated target-lock system, but diverts the excess power from the targeting system into speeding its firing rate, effectively doubling the damage-per-second of the Sentry. Also, the Wrangler provides the Sentry Gun with a protective Shield, which absorbs two-thirds of enemy fire while the Wrangler is active. Once the Engineer shuts off and pockets the Wrangler, however, his Sentry Gun is left defenseless for 3 seconds while its auto-lock targeting computer reboots.


Combat Mini-Sentry Gun

A RED Mini-Sentry Gun
Sometimes, you just need a little less gun.
The Engineer

The Combat Mini-Sentry Gun is a more combat-efficient version of the standard Sentry Gun, and is a component of the Engineer's Gunslinger unlock. The Combat Mini-Sentry Gun has several advantages: it costs only 100 metal to place, constructs at four times the speed of the original Sentry Gun, is deployed at full health and fires 50% faster than a Level 1 Sentry. However, it is neither repairable nor upgradable, as it is intended for short-term use rather than long-term area denial fortification. It also deals only 50% the damage per shot of the original Level 1 Sentry Gun.

Sentry Gun Levels

Level Kill Icon Health Cost Weaponry Damage Ammo
1

RED Level 1 Sentry Gun.png

Killicon sentry1.png 150 (effectively 450 with the Wrangler shielding) 130 Metal Semi-Automatic Firing Barrel 14-18 damage
4 (8 with Wrangler) shots per second
64 (128 with Wrangler) average DPS
100 bullets
2

RED Level 2 Sentry Gun.png

Killicon sentry2.png 180 (effectively 540 with the Wrangler shielding) 330 Metal Dual Rotational Minigun Barrels 14-18 damage
8 (16 with Wrangler) shots per second
128 (256 with Wrangler) average DPS
120 bullets
3

RED Level 3 Sentry Gun.png

Killicon sentry3.png 216 (effectively 648 with the Wrangler shielding) 530 Metal
  • Dual Rotational Minigun Barrels
  • Target Guided Rocket Launch Support System
  • 14-18 damage (bullets), 8 (16 shots with Wrangler) shots per second for 128 (256 with Wrangler) average DPS
  • Rockets fire every 3 seconds (slightly faster with the Wrangler) dealing 100 damage on direct hit
  • 144 Bullets
  • 20 rocket salvos


Combat Mini-Sentry Gun

Level Kill Icon Health Cost Weaponry Damage Ammo
N/A

Red Mini Sentry.png

Killicon sentry1.png 100 (effectively 300 with the Wrangler shielding) 100 Metal Semi-Automatic Firing Barrel 7-9 damage
6 (12 with Wrangler)shots per second
48 (96 with Wrangler)average DPS
100 bullets

Related Achievements

General

File:Tf get turretkills.jpg Sentry Gunner

Accumulate 10 Sentry gun kills with a single turret.

Scout

64px Gun Down

Destroy an active sentry gun using your pistol.

64px If You Build It

Destroy 3 enemy buildings while they are still under construction.

Soldier

Tf soldier engineer to eternity.png Engineer to Eternity

Kill an Engineer as he repairs his sentry gun while it's under enemy fire.

Tf soldier guns of navar0wnedt.png Guns of the Navar0wned

Kill 5 Engineer sentries while you are standing outside of their range.

Demoman

Tf demoman kill engi sentry dispenser.png The Argyle Sap

Blow up an Engineer, his sentry gun, and his dispenser with a single Sticky bomb detonation.

Engineer

Texas two step.jpg Texas Two Step

Use your shotgun to finish off an enemy recently damaged by your sentry gun.

Uncivil engineer.jpg Uncivil Engineer

Provide an enemy player with a freeze cam of you and the sentry that just killed them.

Deputized.jpg Deputized

Get 10 assists with another Engineer where a sentry gun was involved in the kill.

Frontier justice.jpg Frontier Justice

Within 10 seconds, have your sentry kill the enemy that just killed you.

Best little slaughterhouse in texas.jpg Best Little Slaughterhouse in Texas

Rack up 5000 kills with your sentry guns.

If you build it they will die.jpg If You Build It, They Will Die

Haul a level 3 sentry gun into a position that achieves a kill shortly after being redeployed.

Doc stock and barrel.jpg Doc, Stock and Barrel

Repair a sentry gun under fire while being healed by a Medic.

No mans land.jpg No Man's Land

Use a sentry gun to kill 25 enemy players trying to capture a point.

Medic

Tf medic heal engineer.png Midwife Crisis

Heal an Engineer as he repairs his sentry gun while it's under enemy fire.

Sniper

Tf sniper de-sentry-lized.png De-sentry-lized

Destroy 3 Engineer sentry guns.

Spy

Tf spy constructus interruptus.png Constructus Interruptus

Kill an Engineer who is working on a sentry gun.

Trivia

  • The original Sentry Gun designs were created by Radigan Conagher in 1890 [1]. The original and current designs are visually identical.
  • The Engineer apparently designed and built the final version of the Sentry Gun under contract from 'TF Industries' in 1965.
  • The official game manual for Team Fortress 2 is actually the Sentry Gun Operating Manual.
  • 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.
  • A label on the Sentry Gun blueprint reads "Automatic Sentry Aparatus;" however, the Sentry Gun manual refers to it as a "Sentry Mechanical Firing Device".
  • Like all Buildings, Sentry Guns can be built underwater.
  • Sentry Guns cannot fire through a Dispenser built by an Engineer of the same team.
  • 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. Additionally, the higher the Sentry's level, the louder it is. A level 1 sentry is slightly harder to hear than a level 3 Sentry; this fact can be used to counter enemy Sentry Guns.
  • When out of ammunition, a Sentry Gun will continue lock on to enemies and attempt to fire, but will instead make clicking sounds.
  • Engineers can reach higher standing on a level 1 Sentry Gun than with a Dispenser, making it a better choice on jump and puzzle maps.
  • Due to a bug, the rockets from a Sentry Gun may sometimes damage teammates if the Sentry Gun is destroyed as the rockets are in-flight.
  • An unused alternate kill icon for the level 1 Sentry Gun exists in the game files, seen to the right. This was most likely for the Wrangler, as it uses a laser sight mechanic similar to the mentioned kill icon.
Unused level 1 sentry kill icon
Oldesentry.PNG
  • When the Wrangler was added in the Engineer Update, all levels of Sentry Gun were given laser sights to accommodate it.
  • A bug existed where level 2 and 3 Combat Mini-Sentries could be built by building a normal Level 2 or 3 Sentry, switching to the Gunslinger and hauling and redeploying the existing Sentry. The result of this was a miniature version of the Level 2 and 3 Sentries that gained the properties of the Combat Mini-Sentry, such as the 75% damage and the 4x build speed. These Sentries would always appear to be on the RED team but their characteristic light effect would glow their proper team color. This bug has since been fixed.
  • When using the Wrangler, the Sentry and Mini-Sentryʻs laser will auto lock on (aim assist) to targets when you move your crosshairs near them.
  • An image appearing on the Engineer Update page possibly show very early designs of the modern Sentry Gun

See also

External links