There is no real problem exporting to the USA or Australia, an operation that we do routinely.
However, you must find a professional gunsmith who will take care of the acquisition of the rifle in France and who will manage all the documentation and costs linked to exportation.
Finally, and this is not the least concern, you must be extremely careful with this kind of announcement that remains vague as to the condition of the weapon.
The choice of relatively blurry photos and description should raise alarm.
In this case, to be myself interested in this type of weapon, I would not even spend a thousand euros on this Mauser whose condition is not as good as described (!)

DORLEAC
www.dorleac-dorleac.com