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Fallout 3's Gamebryo engine requires all non-player characters, characters and script effects to use a weapon to shoot a projectile. Some of these "weapons" are only meant to be used by the non-player character, but can be obtained via console commands.
The same is true for the default weapons used by followers; while usually different from their standard counterparts, they are not meant to be used by the player either.
*Sometimes this weapon does not do any damage, and leaves most keys unusable (the console, esc button, tab) while it loops the reload animation. If this occurs, reload a save state prior and just drop the weapon.