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The automatic barrel is a weapon mod in Fallout 76.

Effects

When applied to a plasma or Enclave plasma gun, the mod converts the weapon into an automatic weapon, increasing rate of fire and recoil while decreasing range and ammo capacity. It also decreases aimed and hip-fire accuracy.

When applied to a Tesla rifle, the mod converts the weapon into an automatic rifle, increasing the rate of fire while decreasing range and aimed accuracy.

Technical details
Enclave plasma gun  
Short barrel Automatic barrel Net change
Damage - -15.0% -15.0%
Damage, energy - -15.0% -15.0%
Fire rate - - -
Automatic - True True
Range, max +900.0% +1600.0% +700.0%
Range, min +500.0% +900.0% +400.0%
Recoil, max -10.0% +50.0% +60.0%
Recoil, min -10.0% +50.0% +60.0%
Weapon spread, max - +100.0% +100.0%
Weapon spread, min - +100.0% +100.0%
Sighted weapon spread -20.0% -45.0% -25.0%
Sighted transition speed - +3.0% +3.0%
AP cost - +25.0% +25.0%
Ammo capacity - -10.0% -10.0%
Durability - -11.0 -11.0
Weight - +60.0% +60.0%
Value +10.0% +35.0% +25.0%
Impact data - <PlasmaSmallImpactSet>
Projectile override <ProjectilePlasmaLarge> <ProjectilePlasmaSmall>
Keywords <s_30_Auto>,
<dn_HasBarrel_Short>
<AnimsLaserBarrelRapid>,
<dn_HasBarrelSpinning>,
<s_30_Auto>,
<remapNode>,
<WeaponTypeAutomatic>
Plasma gun  
Short barrel Automatic barrel Net change
Damage - -15.0% -15.0%
Damage, energy - -15.0% -15.0%
Fire rate - - -
Automatic - True True
Range, max +900.0% +1600.0% +700.0%
Range, min +500.0% +900.0% +400.0%
Recoil, max -10.0% +50.0% +60.0%
Recoil, min -10.0% +50.0% +60.0%
Weapon spread, max - +100.0% +100.0%
Weapon spread, min - +100.0% +100.0%
Sighted weapon spread -20.0% -45.0% -25.0%
Sighted transition speed - +3.0% +3.0%
AP cost - +25.0% +25.0%
Ammo capacity - -10.0% -10.0%
Durability - -11.0 -11.0
Weight - +60.0% +60.0%
Value +10.0% +35.0% +25.0%
Impact data - <PlasmaSmallImpactSet>
Projectile override <ProjectilePlasmaLarge> <ProjectilePlasmaSmall>
Keywords <s_30_Auto>,
<dn_HasBarrel_Short>
<AnimsLaserBarrelRapid>,
<dn_HasBarrelSpinning>,
<s_30_Auto>,
<remapNode>,
<WeaponTypeAutomatic>
Tesla rifle  
Semi-auto barrel Automatic barrel Net change
Damage - - -
Damage, energy - -1500.0% -1500.0%
Fire rate - - -
Attack delay - 0.3 +0.3
Automatic False True True
Range, max +1800.0% +1600.0% -200.0%
Range, min +1100.0% +900.0% -200.0%
Recoil, max -10.0% -10.0% +0.0%
Recoil, min -10.0% -10.0% +0.0%
Weapon spread, max - - -
Weapon spread, min - - -
Sighted weapon spread - -25.0% -25.0%
Sighted transition speed - - -
AP cost - +25.0% +25.0%
Durability -10.0 -8.0 +2.0
Weight +15.0% +20.0% +5.0%
Value +40.0% +50.0% +10.0%
Projectile override <ProjectileDLC01_LightningGun> <ProjectileDLC01_LightningGun> N/A
Keywords <remapNode_CBarrelSlide_PBarrelSlide>,
<dn_HasGrip_Rifle>,
<IsAmmoType_FusionCell>
<remapNode_CBarrelSlide_PBarrelSlide>,
<s_30_Auto>,
<dn_HasMuzzleAuto>,
<dn_HasGrip_Rifle>,
<WeaponTypeAutomatic>,
<IsAmmoType_FusionCell>

Learn chance

Very low chance
Weapon Plans Learn chance
Plasma gun Learned from scrapping Very low (10%)
Low chance
Weapon Plans Learn chance
Tesla rifle Learned from scrapping Low (15%)
Unlearnable
Weapon Plans Learn chance
Enclave plasma gun Unlearnable N/A (0%)

Production

Plasma gun
Materials:Requirements:Produces:
Gear (5)
Oil (2)
Screw (5)
Silver (2)
Steel (8)
Range
Relevant plan
Level
Automatic barrel (1)
Tesla rifle
Materials:Requirements:Produces:
Gear (4)
Screw (4)
Silver (2)
Range
Relevant plan
Level
Automatic barrel (1)

ID table

Weapon OMOD editor ID OMOD ID MISC editor ID MISC ID
Enclave plasma gun mod_Enclave_PlasmaGun_barrel_Spin_Base 0018C6BD miscmod_mod_Enclave_PlasmaGun_barrel_Spin_Base 0031D599
Plasma gun mod_PlasmaGun_barrel_Spin_Base 0018C414 miscmod_mod_PlasmaGun_barrel_Spin_Base 0031D5BC
Tesla rifle DLC01_mod_LightningGun_Barrel_Automatic 0010F630 miscmod_DLC01_mod_LightningGun_Barrel_Automatic 0010F6A1

Location

  • The automatic barrel mod may be crafted and applied at a weapons workbench if the relevant plan is known. It can only be learned from scrapping weapons of the same type.
  • The mod for the Enclave plasma gun is unlearnable and thus can only be obtained already attached to an existing weapon found in the world. The loose mod exists in the game files, but cannot be found in-game.
  • Loose mods for the Tesla rifle may be randomly sold by Responder, Raider, Brotherhood, and Free States vendors. They may also be found randomly in various locations or earned as quest rewards in The Mire, Savage Divide, or Cranberry Bog. Loose plasma gun mods exist in the game files, but cannot be found in-game.