I know a man who was born in Holland before WWII. When Germany invaded Holland, one of the first things they grabbed was the records of registered firearms. They went to this man's uncle, who had a registered rifle and shotgun, and told him that he had one hour to turn in his guns or they would kill him. He turned in his guns and lived to acquire other guns when freedom returned to
Holland.
If the Goverment ever shows up at my door demanding my guns, I can say that I will give them the ammunition first. Realistically speaking; that ain't what I'm gonna do. Unless it is "your guns or your life", my guns, ammunition, and reloading equipment and supplies will be hidden in a national forest. They can search my house, but they won't find anything. When freedom returns to America, my guns will be recovered by me, my children, my grandchildren, or some descendent.