High Mortal mercenaries can get an autoloading ammobelt from which they can recharge their blasters.
There is a quest on planet Gamorr that you need to complete before getting the belt. The quest is hard and time consuming. Make sure you have enough resources and time before attempting to solve the quest. (As of as of May 2022, multiple people can attempt the quest per boot.)
Note: Everything about the quest is considered secret!