I’m sure they’ll turn them right in
As a result, at least one Federal Firearms Licensee has refused to allow police officers who have purchased guns to have the magazines that come with them, because those factory standard magazines hold more than seven rounds. The FFL fears selling the guns he has with the magazines they came with would be breaking the law, even when the purchasers are cops, because there are no clear provisions in the bill allowing a police exception to the ban.
Hmm. Is there an exemption built in for the dealer to have them?