How old?

[Aperta]

that's what i was planing on doing using a living will so that way when i go into military my dad can legally keep it.

[O2HeN2]

A will doesn't work unless you die. A will is not an entity that can own an NFA item. Only a trust can.

O2

[spqrzilla]

that's what i was planing on doing using a living will so that way when i go into military my dad can legally keep it.

A "living will" is the term usually used to describe a document that informs people of the person's wishes regarding medical treatment. It isn't a document that creates an independant entity capable of owning NFA items.

I'd really like to know what the OP and his friend think a "living will" is.

[Circuits]

You don't have to be 21 to buy NFA. You have to be 21 to buy anything but a rifle or shotgun from an FFL. Instate private purchase of NFA or handguns is perfectly legal at 18.