From the article:
The holy grail of those who wish us disarmed is gun registration. Once your guns are required to be registered, they are, in effect, already confiscated. A little thought will reveal to you why this is so. The Government will know who has legal possession of each firearm. They will know where the firearm is stored. When physical possession of the gun is desired, they can order you to turn it in. This has happened repeatedly. The historical examples include NAZI Germany, Soviet Russia, Red China, and Cambodia.
How many people know that in Cambodia, 25% of the population was exterminated? In a US population numbers (350 million), that would be the equivalent of 87.5 million people rounded up and killed by the government.
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
The founders were not speaking of securing a free state of oppression from other countries. They were putting in place a safe guard to keep the citizens free from oppression from our own government.