from what I understand and I could be wrong...... a non-resident of the US can't even have gun parts in their possession in the US .... unless things have changed very recently or I am misinformed/misunderstanding.
I'll edit to add that in my experience, unless it's coming in an already built rifle from the states , true usgi m14 parts like bolts and barrels are not exportable. This is why dealers like armtac that have had usgi parts kits in the past, were not able to offer a "usgi bolt and barrel" in the kits.
non usgi bolts for the "M1A", like fulton and LRB ect are able to be imported only if the manufacturer is licenced to export the part..... at least that is my understanding. certain parts require end user licence, like some parts from brownells, Krieger barrels ect ect
having your friend buy a bolt and find a way to get it across the border to you would fall under the "better not do" or "don't ask don't tell" category hehehe