I'm unsure of the laws and such but i would have thought you exporting a Mak in your baggage into the US would have the US customs crawling through it and you possibly arrested???
If i remember correctly our sponsors JSRamsbottom were a good supplier of the Mak pistols before the VCR bill, contact them and they would surely put you straight on the export legals!
Good little fun gun the Maks, I had 2 but got fed up of the inaccuracy of the lead bb's, be much better if they fired .177 pellets
ATVB PAUL