This article is considered accurate for the current version (1.58) of the game.
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The Collins Cannon is a mobile Anti-Tank field gun firing 68mm armour-piercing rounds.
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— In-game description
The Collins Cannon 68mm (also known as a Field Anti-Tank or FAT) is a WardenField AT Gun. It is equipped with a 68mm main cannon. Its most distinctive feature is the barrel, which is long and has no muzzle break at the end.
The Collins Cannon 68mm houses a crew of two soldiers:
Driver (Left Side)
Controls the movement of the vehicle - requires a soldier in the Gunner seat in order to move
Gunner (Right Side)
Controls the reloading, and firing of the chassis-mounted 68mm main cannon
Required to move the vehicle
NOTE: Despite not having an actual Passenger seat, it is possible for a soldier to stand on the Spade (the long metal piece on the back of the vehicle) and move with the crew.
Unlike enclosed vehicles, Field Weapons cannot switch seats, requiring the crew to exit the vehicle in order to change seats.
Armament
The Collins Cannon 68mm is equipped with one main armament:
The Collins Cannon 68mm is specifically designed to attack enemy vehicles, as its main shell, the 68mm, is specially designed to penetrate enemy armor.
Due to 68mm being an AP round, it has a higher chance of penetrating armor. Targeting enemy vehicle's subsystems is highly recommended.
Chassis
All push guns, by their nature, are one of the most vulnerable vehicles in the game in terms of crew protection. They are exposed to the enemy, making them susceptible to all enemy fire. Due to push guns requiring both crew members to move them, the death of a single crew member could result in the push gun being lost. Due to this, it is recommended to only lock the gun when it looks like enemy infantry are going to overwhelm you and can steal it. This tactic is vital if a push gun is decrewed, as it allows a friendly soldier to quickly man it and drive it back to safety.
Visibility Mechanics
Push guns have a visibility mechanic, which allows it to operate differently compared to regular vehicles. Similar to infantry, they are affected by vision, meaning their movements cannot be seen unless it is within your line of sight. Due to this, they can hide behind structures, or even bushes (depends on how big the bush is). It's also affected by the time of day, with nighttime making it possible for push guns to become invisible to the enemy if you're far enough from them. Keep in mind that if the enemy decides to illuminate your position, this will expose it until the flare dies out. The push gun's position will be exposed anyway if the crew decides to fire its main armament.