Talk:Arcane Tanker/@comment-185.39.113.56-20190919195900/@comment-5.45.140.95-20190919200456

"When used in ground combat, Arch-guns only have a limited amount of ammo along with using magazines and standard reloading. Once all of an Arch-gun's ammunition is used up, the weapon is removed and can only be called down again after a 5-minute cooldown period. Ground-based Arch-gun ammo can only be replenished by Heavy Ammo, which can drop from heavy-duty enemies like Bombards, Corpus Tech, and Ancients. Picking up Heavy Ammo also resets the Archgun Deployer's 5-minute cooldown.  Ammo Case's ammo conversion does not work on grounded Arch-guns."

5th paragraph of the Arch-gun page. Yep, innate cooldown basically