Fallout – Do followers use ammo for a new gun

fallout-new-vegas

If I gave Cass a 12-gauge shotgun to replace the one she currently uses, which is a 20gauge, would I need to give her 12-gauge ammo for her to use it? Would she use up that ammo?

Best Answer

Followers have Magical Companion Ammo for their default guns, but if you want them to use any other weapons, you'll need to supply them with ammo.

They will also stop using a weapon if it breaks, according to the wiki. However other sources online report that companion's weapons won't break and that you should use surplus ammo for them to save caps. I never game my companions other weapons so I can't confirm or refute this.