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For the full list of mods in Fallout: New Vegas, see Fallout: New Vegas weapon mods. For the full list of mods in Fallout 4, see Fallout 4 weapon mods. For the full list of mods in Fallout 76, see Fallout 76 weapon mods. |
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Weapon mods have appeared in one way or another in Fallout, Fallout 2, and Fallout 3. They appear as an active feature for the first time in Fallout: New Vegas due to their popularity as a third party mod in Fallout 3. New mods were introduced with the new crafting system in Fallout 4. Fallout 76 has a similar system of weapon modding except one needs to scrap weapons in order to learn the mods and it decreases max weapon durability.
Fallout
Only Smitty can perform modifications in Fallout, and the only weapon he can upgrade is the Winchester P94 into a turbo plasma rifle.
Fallout 2
In Fallout 2, gunsmiths can upgrade some weapons for the Chosen One. One of Skeeter's quest rewards is a free weapons upgrade.
| Vault City Downtown | Gecko junkyard | New Reno Arms | Buster's Fine Emporium of Armament | |||||
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| Original weapon | → | Upgraded weapon | Upgrade effect | Valerie | Skeeter | Eldridge | Algernon | Buster |
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→ | 
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Reduces reloading cost to 1 AP | $650 / $800 | ~$2,000 | no charge | 
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→ | 
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Increased damage | $650 / $750 | ~$3,000 | no charge |
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→ | 
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+12 magazine capacity | $850 / $1,000 | ~$3,000 | no charge |
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→ | 
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Weapon Scope Range |
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~$4,000 | no charge | $500 | |
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→ | 
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+76 magazine capacity | $1,350 / $1,500 | ~$6,000 | no charge |
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→ | 
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Removes penalties for illumination | $3,100 / $3,500 | ~$12,000 | no charge |
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→ | 
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Increased damage |
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no charge |
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→ | 
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Weapon Penetrate |
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no charge |
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→ | 
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+16 charge capacity |
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no charge |
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→ | 
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+12 charge capacity |
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no charge |
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→ | 
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Increased damage |
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no charge |
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→ | 
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Increased damage and Weapon Flameboy |
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no charge |
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→ | 
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Better DR mod |
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no charge |
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| Notes | Reduced price if Charisma is 6 or greater or Barter is 75% or greater | Actual cost is the base price listed above multiplied by (250/(160+ Barter)) |
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Buster will only upgrade a hunting rifle once | ||||
Fallout 3
The only upgrades seen in Fallout 3 are scopes, the occasional use of silencers and the use of extended magazines. Other differences between unique weapons do not technically count as weapon mods, seeing as there is only one of each unique weapon.
Fallout: New Vegas
One of the features added to Fallout: New Vegas is the ability to further customize certain base weapons. While in Fallout 3 this was limited to the creation of custom weapons, Fallout: New Vegas takes this a step further by allowing the creation of weapon variants based on basic weapons by adding associated weapon mods.
Modded weapon versus unique
The use of weapon mods is not possible with weapons that are considered unique, with the exception of the weathered 10mm pistol (which accepts the base 10mm pistol's mods) and the mercenary's grenade rifle (which accepts the base grenade rifle's long barrel) 
and the holorifle (it has its own set of mods) 
. While unique guns typically have better base stats than their standard variants, Obsidian Entertainment introduced the inherent drawback of unique weapons being exclusively unmoddable to balance out the utility of unique versus normal weapons, making the choice between the two less of an obvious decision and more of a preference. That said, some weapons' unique variants are designed with their available mods pre-attached and with better base stats too; such is the case with the varmint rifle's unique variant, Ratslayer, which comes equipped with its extended mag, night scope, and silencer mods and boasts significantly higher Critical Chance and superior scope magnification (3.5x compared to the 2.86x on a standard varmint rifle scope)
Acquiring mods
Weapon mods will never spawn as loot in the game world, nor will they appear on weapons carried by NPCs or sold by merchants. The only way to acquire weapon mods is to purchase them separately from certain stationary merchants or traveling merchants.
Usage
By themselves, weapon mods are weightless and serve no function, but once attached to their specified weapon, will change the characteristics, look and/or function to create a distinct variant. The weapon mods range from scopes and silencers to extended mags and several in-between. In the case of the varmint rifle and other such weapons there exists more than one different type of modification. While one is not limited in the amount of total mods they can apply to a single weapon, they are limited to one of each type of mod per given weapon and therefore are not able to stack attributes like attaching the same mod twice to increase rate of fire.
Once a weapon mod is attached to a weapon it cannot be removed and remains a permanent feature of that individual weapon, along with its added attribute. However, care should still be taken when equipping weapon mods; for example, extended magazines are almost always beneficial unless the weapon's magazine must be reloaded on a shell by shell basis (ex: the cowboy repeater), forcing a longer reload (not necessarily forcing the reload to be longer, since pressing the fire button stops the reload); scopes also have pros and cons, as they may increase maximum range, but make the gun harder to use in close combat situations.
The addition of a mod to a weapon will permanently increase the overall monetary value of that weapon by the value of the mod, even if the weapon is completely broken at the time it is applied.
Fallout 4
Weapon mods can be built from raw materials and attached to weapons at weapons workbenches. There are over 700 mods[1], including scopes, barrels, stocks and more. For guns the Gun Nut perk is required, while Science! is required to modify energy weapons and advanced modifications for guns and Blacksmith is required for most melee weapons mods.
Most pistols, rifles and shotguns offer the option to customize grips/stocks, receivers and sights, changing which perks affect the weapon.
- Any weapon with an automatic receiver gets bonuses from the Commando perk.
- Pistols with non-automatic receivers get bonuses from the Gunslinger perk.
- Rifles and shotguns with non-automatic receivers get bonuses from the Rifleman perk.
- The Sniper perk only works on non-automatic rifles with scopes which use the "hold breath" mechanic.
Grip mods create pistol weapons, while stock mods create rifle weapons. This allows for almost any ranged weapon to be customized to fit the player character's build.
Fallout 76
In Fallout 76, weapon mods are done similarly to Fallout 4 with the main differences being one has to learn the mod by scrapping weapons and it reduces max condition.
Appearances
Weapon mods appear in Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Fallout 4, and Fallout 76.
Gallery
