I have an AIA mag still that I modded with a hole like the real mags before I knew the laws. (It was very early on in the debate, and an M14 and an AIA were my first rifles)Live and learn I guess, I disassembled it as soon as I knew so the gestapo wouldn't kick my door in, as I immediately became a felon of the lowest order.
If I get this hole filled in somehow would it be back to a legal mag?
ORRR...since it works without the modification does it even matter?
Nope, since you modded it, you essentially re-designed it fit a semi automatic rifle, thereby reducing it's capacity to 5. Good thing you dismantled it. Not worth 3 years in jail if your caught with it.
Stupid laws.