Exploring the post-apocalyptic wasteland of Fallout 4 is significantly safer when you bring along a trusted companion to watch your back. However, managing their inventory can quickly become confusing when you start equipping them with upgraded gear. Understanding how their internal weapon mechanics operate will save you from common tactical errors during heavy combat encounters.
The Unlimited Default Weapon Rule
Every companion in the game arrives with a unique signature weapon that they will use by default. This base firearm never consumes ammunition, meaning they have an infinite pool of bullets for that specific weapon type. You can confidently let them fire their starting pistols or rifles forever without ever placing extra rounds into their gear slots.
This convenience disappears entirely the moment you decide to upgrade their firepower with a customized weapon. If you force a companion to equip a completely different gun from your inventory, they will actively consume ammunition just like the player character does. Once their stockpiled bullets run dry, they will immediately swap back to their default weapon to continue fighting.
Equipping Custom Firearms and Managing Ammo
To successfully transition your ally to a stronger gun, you must manually transfer the appropriate ammunition type into their inventory screen. Unlike regular settlement workers who only require a single bullet to fire indefinitely, active traveling companions consume exactly one round per shot. This mechanic forces players to consistently balance their own resource needs against the gear requirements of their active followers.
There are a few notable tactical exceptions regarding heavy weapon categories that you should keep in mind. Giving a companion a missile launcher or a Fat Man tactical nuclear weapon can be incredibly dangerous for your own health. Their combat artificial intelligence will freely fire these explosive payloads regardless of how close you are standing to the blast zone.
Inactive Followers and Settlement Defense
The core ammo mechanics undergo a significant change when you dismiss a companion and send them back to a localized settlement. While stationed at a base, inactive followers adopt the standard rules applied to basic commonwealth settlers. Under these specific conditions, they only need a single bullet of the required type to achieve infinite firing capabilities.
This distinct mechanical shift allows you to heavily fortify your defensive outposts without burning through your personal armory supplies. Simply hand a dismissed follower a powerful rifle, add one matching round of ammunition, and ensure the weapon is fully equipped. They will successfully defend your borders from incoming raider factions without ever draining your stash.
