Sentry gun

From TF2 Wiki

The Sentry gun is an automated turret which will fire upon any enemy who walks into its line of sight.

It is a type of building produced by the Engineer class. It costs 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 stronger in various ways. It also gains a slow but strong rocket attack at the final upgrade level.

• Ammo capacity increases
• Durability (health) improves
• Weapon damage increases
• Target lock-on rotation speed increases
• Knock back increases

Note that the range at which a Sentry detects an enemy remains constant regardless of upgrade level. When placing a sentry, the limit of this range is represented by a 3D sphere in your team color.

When being constructed, a sentry's health increases gradually until it reaches its maximum health when it is completely built.

Sentry guns are sometimes known as "turrets," "sentries," "SGs," or just simply "guns." A destroyed Sentry gun leaves 60 Metal worth of pieces. These pieces can also be picked up by other classes as Ammo.

The Sentry rotates 90 degrees to patrol the area, but is capable of rotating 360 degrees to lock on to a target, which takes an additional but small amount of time. The Sentry can be manually rotated to face a different direction before building it: When the blueprint is shown, using the special attack button (default key: MOUSE2) will rotate the blueprints clockwise by 90 degrees.

It is important to place a sentry so that you are able repair it without standing in its line of fire as a sentry will damage the engineer who built it at the same rate as it would a normal enemy.

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.

The Sentry may kill it's Engineer. One tactic is, as a spy, hide in the back of a Dispenser and wait. Uncloak, then disguise back. The Engineer and possibly the Dispenser will be blow to pieces from a level 3 Sentry Gun.

The artificial intelligence of the Sentry Gun is very simple. It will always turn to shoot at the closest enemy player. This is why it is important for Medics using ÜberCharge on Pyros and other close-range classes to move forward and to the side, as it causes the Sentry to switch targets back and forth, depending on which of the ÜberCharged pair is closer.

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.

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.

Interestingly, it is possible to get critical level 3 sentry rocket salvos. If a medic uses the kritzkrieg on a pyro, and said pyro reflects the rockets of an enemy sentry, the salvo is critical. The exact damage is uncertain, but it must be fairly high considering that normal direct hits can do ~150 dmg.

Contents 1 Level Statistics 2 Trivia 3 See also 4 External links

Level Statistics

Level	Health	Cost	Weapon	Damage	Ammo
	150	130 Metal	Semi-Automatic Firing Barrel	13-20 damage 2 shots per second 26-40 DPS	About 44 Bullets
	180	330 Metal	Dual Rotational Minigun Barrels	13-20 damage 4 shots per second (estimate) 52-80 DPS	About 64 Bullets
	216	530 Metal	Dual Rotational Minigun Barrels Target Guided Rocket Launch Support System	13-20 damage (bullets), 8 shots per second (estimate) for 104-160 DPS Rockets fire every 4 seconds doing 150 damage on direct hit	160 Bullets 20 rocket salvos

Trivia

• 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".

• 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.

• It is much harder to stab'n'sap or circle strafe a level 3 sentry gun than a level one sentry gun due to the high turn speed.

• When 4 Engineers simultaneously wrench a Sentry Gun as it builds, it finishes in 0.625 seconds.

• Engineers can climb higher with a level 1 Sentry Gun than with a dispenser (useful to know 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.

• Sentry Guns may be built underwater.

• A Level 3 Sentry's rockets count as a single projectile, despite it being four rockets. This means a Pyro deflecting a cluster of sentry rockets with the air compression blast is credited once towards the Hot Potato achievement.

• 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.

See also

• Meet the Sentry

External links

• Sentry gun manual

Buildings
Sentry gun	•	Dispenser	•	Teleporter