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)
Icon range
Icon 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


Can be found and used at any weapons workbench, if the player possesses the above materials.


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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