The United States Constitution defines this as a militia country in Articles I and II as well as in the Second Amendment. In a militia country the majority of ordinary citizens possess weapons suitable for combat and can bring them to muster if mobilized. Congress is empowered to regulate the militia and interstate commerce, so all Federal gun laws must come under these powers to be Constitutional. Powers reserved to the States include the power to regulate the storage and transportation of militia weapons. The very first gun control laws in the country were city ordinances restricting carrying firearms within city limits to law enforcement officers. The original purpose of the NRA was to promote knowledge and skill with rifles, a necessity for a militia country in which most folks don't hunt. No person may be deprived of the right to keep and bear arms without due process of law. Many have lost their gun rights in court. All firearms sales are supposed to comply with those laws too.
David P. Vernon
Disclaimer: As submitted to the Arizona Daily Star.