Article says : "“It took the clerk 24 seconds to insert the spring in the magazine and we instantly had an illegal, 30-round magazine. Total cost, 25 bucks.”

Sounds like the clerk is the one that built the illegal mag which would then be against the law right? Looks like the Clerk sold an illegal mag and the reporter bought the illegal mag. Both should be taken off to jail or whatever the punishment is. What is the punishment for this anyway?