Importing a Luger From Canada

I've located a couple decent priced Lugers in Canada recently and was wondering if anyone has experience with importing to the US. I've found some info online but there's not a good complete source of info that I've found. I did find some info that a regular FFL holder can occasionally import, but I'm not sure if they can import a former military weapon. Also if a regular FFL dealer can import, what are the requirements for import marking? I know I could definitely go through an importer such as Simpson's, but this may get expensive. I've also read some info that there is a 10% import tax (maybe customs) on all firearms, and this is based on all the costs including shipping. How is this payment handled? If anybody has experience on importing Lugers I'd like to hear about it and what costs were involved.