This article is considered accurate for the current version (1.56) of the game.
The AT Gun Garrison is a player-built defensiveBunker modification that automatically fires at enemy vehicles with an anti-tank cannon when garrisoned. It can be upgraded for better health and stronger resistance.
When its garrison is active (large flag on top), it automatically fires a 68mm cannon on any enemy vehicle or structure within 28 meters (30m from its center) in a 180 degree firing arc but ignores enemy infantry. It is very accurate but is slow to turn and goes back to facing its original direction once it loses its target. The gun takes 2 seconds to reach its normal fire rate (20 rounds per minute by default) and accuracy. Getting shot by an enemy in a vehicle or structure triggers its retaliation fire for 15 seconds, it locks on and fires at the vehicle/structure if it is within 58 meters (even at night) and its line of sight isn't obstructed. If the AT Gun Garrison is attached to other bunkers it will only retaliate if actual damage is dealt (e.g. not small arms) but will also retaliate if a connected bunker is damaged.
Unlike other bunker garrison, friendly players cannot get inside it.
Infrastructure Bonus
Note that the effects of the following are unclear and contradict AI retaliation mechanics so don't bank on them.
The fire rate of the gun can be increased by adding certain "Garrison" type Infrastructure Modifications to the connected Bunker Base network. 3.33% increase per infrastructure, up to 66.6% increase. The maximum fire rate is 33 rounds per minute.
Construction
A Tier 2 AT Gun Garrison can be constructed on any Tier 2 Bunker with the following requirements:
Connected to a Bunker Base through trenches or bunkers
Bunker Base must have unlocked the AT Gun Garrison tech
The direction of the gun is chosen by moving the Mouse Wheel while your cursor is on the AT Gun option of the Hammer's upgrade menu.
The Tier 2 AT Gun Garrison modification moderately decreases the Structural Integrity of its bunker.
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An entrenched AT gun manned by stationed troops.
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— In-game description
Defense
It is immune to small arms, fragmentation grenades, and 12.7mm machine gun fire. It's also pretty resistant to most explosives.
When its garrison is active (large flag on top), it automatically fires a 68mm cannon on any enemy vehicle or structure within 28 meters (30m from its center) in a 180 degree firing arc but ignores enemy infantry. It is very accurate but is slow to turn and goes back to facing its original direction once it loses its target. The gun takes 2 seconds to reach its normal fire rate (20 rounds per minute by default) and accuracy. Getting shot by an enemy in a vehicle or structure triggers its retaliation fire for 15 seconds, it locks on and fires at the vehicle/structure if it is within 58 meters (even at night) and its line of sight isn't obstructed. The retaliation also triggers if a connected bunker is attacked.
Unlike other bunker garrison, friendly players cannot get inside it.
Infrastructure Bonus
Note that the effects of the following are unclear and contradict AI retaliation mechanics so don't bank on them.
The fire rate of the gun can be increased by adding certain "Garrison" type Infrastructure Modifications to the connected Bunker Base network (2% increase per infrastructure, up to 40% increase).
Construction
A Tier 3 AT Gun Garrison can be constructed on any Tier 3 Bunker with the following requirements:
Connected to a Bunker Base through trenches or bunkers
Bunker Base must have unlocked the AT Gun Garrison and Concrete Structuresupgrades
The direction of the gun is chosen by moving the Mouse Wheel while your cursor is on the AT Gun option of the Hammer's upgrade menu.
An existing Tier 2 AT Gun Garrison can also be upgraded to Tier 3 if it is connected (by trenches or bunkers) to a Bunker Base with the Concrete Structures upgrade. It's the cheaper method as you only spends Concrete Materials once overall.
As a concrete structure, it takes 24 hours to dry, during which it is more vulnerable the wetter it is.
The Tier 3 AT Gun Garrison modification slightly decreases the Structural Integrity of its bunker.
Power
If an AT Gun Garrison is powered with 600W, the spotlight on top of it turns on and allows the garrison to get a few more meters of during the night. Powering the defense does NOT activate its AI! The direction of the spotlight doesn't matter, when enemies are in range the spotlight follows them.
Gallery
Tier 2 AT Gun Garrison on the left, Tier 3 on the right
to the connected Bunker Base network. 3.33% increase per infrastructure, up to 66.6% increase. The maximum fire rate is 33 rounds per minute.
