IANAL, but the executor of the estate can hold it for you until you are 21, then you can just go get it. (you *might* can inherit it at 18, I don't know) This is a special case that does not have to go through a FFL transfer. I don't know anything about NJ law, that's the federal law.
If he gifts it to you while he's still alive, you will have to transfer thru a New Jersey FFL.
"The only way to stop a bad guy with a gun is with a good guy with a gun"