Simple, if its been owned and registered before the ban (pre-ban), you keep it until you're dead, then your survivors have to sell it out of state. I plan to live forever---so far, so good (Steven Wright).
You'd be surprised at how many FALs are still being built every day, even Now.
If you want to learn about the FAL, go to the FAL Files and have a look, I will try to get some FAL Guy's to come here and educate those interested.
When I give up my FAL, I will be dead. FAL, the most prolific Battle Rifle yet made.