The idea that federal agents could come to your house and take away your gun is extremely scary, not to mention the idea that a foreign country could tell our government what to do, luckily, the story does have a happy ending:
The bitter international dispute that began when the Polish government had U.S. federal agents seize a rare rifle from a Fredericksburg gun collector has ended. Poland is buying the weapon.
The collector will get $25,000 for the wz.38M Maroszek rifle, along with a promise that it will be displayed in the Warsaw Uprising Museum. The country also agreed to send Kristopher Gasior, the 54-year-old Virginia collector, a thank-you letter noting his “valuable contribution to preserving Polish historical memory and to honoring Polish heroes and freedom fighters by saving and preserving this unique rifle.”
….
Gasior — a married father of two who speaks proudly of his parents’ service in the Polish Home Army and of learning to read from his family’s Polish military history books — contended that he bought the rifle in 1993 from another collector, and he considered it a sort of “war trophy,” carried into the United States legally by a soldier who got it during World War II.
Polish officials contended that could not be so, because war trophies are taken from enemies, and the Maroszek was made for Polish soldiers who fought on the same side as U.S. troops. Because the gun was made exclusively for Polish military members, it belonged to Poland, they said. That it might have been seized by the Germans and then passed to American hands did not change that.
Source: http://www.washingtonpost.com/local/crime/settlement-in-case-of-rare-polish-rifle-seized-from-virginia-gun-collector/2013/11/11/99d77bfa-48ae-11e3-a196-3544a03c2351_story.html
It is surprising that Poland would go through all this trouble to get one gun.