[zxcvbob]

So would an emancipated minor be able to give himself the written permission to posess a handgun? (he still wouldn't be able to buy it from an FFL)

"a juvenile may possess and use a handgun or ammunition with the prior written approval of the juvenile’s parent or legal guardian and at the direction of an adult who is not prohibited by Federal, State or local law from possessing a firearm;
(iii) the juvenile has the prior written consent in the juvenile’s possession at all times when a handgun is in the possession of the juvenile; and
(iv) in accordance with State and local law; "

I'll say yes...

(this was a lot simpler before 1968, and I don't remember it being a problem)