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Every turret except the launcher faces in one of 8 directions. Ammo must be fed to turrets via conveyors, from any direction except the direction the turret is facing. Diagonal turrets can be fed from all four sides. Ammo-based turrets can hold up to one stack of one resource type and only accept incoming resources when completely empty.
If a tile containing both a building and a unit is hit, both take full damage.

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Gunner

Has a vision radius of √13. Can only target the closest non-empty tile in the direction it is facing. Using refined axionite as ammo deals double damage.

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Sentinel

High range, low damage support turret. Can hit all tiles within 1 king move (Chebyshev distance) of the straight line in its facing direction, within vision range. Using refined axionite instead of titanium as ammo adds +3 to the action and move cooldown of any unit directly hit — acting as a stun.
Sentinels with refined axionite ammo are extremely powerful — a +3 cooldown stun can completely shut down enemy builder bots.

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Breach

Very high damage with splash. Attacks in a 180° cone in the facing direction.
Breach turrets have friendly fire on the splash damage (8 surrounding tiles). They do not damage themselves.

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Launcher

Picks up and throws adjacent builder bots to a target tile within range. The target tile must be bot-passable. Unlike other turrets, launchers have no facing direction and do not use ammo.