Rules question for a first time arbitrator
I am getting a campaign going and trying to figure out how the list of weapon a character can take according to the data sheets relates to the limit of rare weapons in campaign play. Example: ashwaster have long rifle as a basic weapon but it’s a rare 7 weapon. Also does them having as basic not make it special anymore? Sorry if it’s stupid but rules seem to be wide and varied and just trying to get a handle on it. Thanks