How many recruits are there in the radiant Iron Brotherhood?

Go to the task. In the conversation with elders after entering the bunker, you can choose the first item to buy primary items, or talk to the woman who sells things, and then find a new person with a name in the bunker and take the task to find a laser pistol, so you can get a three-eye laser gun (brand-new) and then buy a completely unlocked one.