Unless it's of incredible sentimental value -
I would recommend buying an M1 from the CMP -
They have some history, too.
I have imported C+R firearms from Europe on a form 6, using a legal import export broker here in the US, it is somewhat expensive, and not 100% -
BATF Form 6 - $150 - ish per form.
Broker - $150-$250
Shipping - $150+
Customs Import fees - $'s