The automatic barrel is a weapon mod for the Institute laser, the laser gun, the Tesla rifle and the plasma gun in Fallout 4. It requires at least rank 1 of the Science! perk.


The automatic barrel provides a better rate of fire, range and sighted accuracy in exchange for worse recoil, reduced ammo capacity and poor hip-fire accuracy.


The recipe for this weapon mod varies depending on the weapon for which it is made:

Circuitry (2-3)
Crystal (3-4)
Gears (4-5)
Oil (0-2)
Plastic (0-7)
Screw (4-5)
Silver (2)
Steel (0-8)
rangeIcon range
levelIcon level
Automatic barrel (1)

Weapon Science! Adhesive Circuitry Crystal Fiber optics Gear Oil Plastic Screw Silver Steel
Institute laser 1 2 2 3 5 4 0 7 4 2 0
Laser gun 1 2 2 3 5 4 1 7 4 2 0
Plasma gun 1 2 3 4 2 5 2 0 5 2 8


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While this mod increases the effective damage per second of weapons it can convert into an automatic, it also greatly increases the ammunition usage of the weapons.

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