This is headed towards the California style non-detachable magazines............ so as if the magazine is in place and can not be rapidly replaced with another................. The name escapes me at the moment.
That is what Sullivan wants.
".....If manufacturers and gun owners want to continue selling and using the weapons, Sullivan said, they would need to adjust to firearms that can only be loaded slowly, bullet by bullet, from the top of the weapon ? not through detachable magazines......."
So you can still sell AR's but the magazine can't be readily removed, basically have it pinned in place.