This distinction is crucial, because natural rights are articulated as endowed by God, while legal rights are endowed by government. The Founding Fathers understood natural rights to exist independent of—or in spite of—government. They simply exist for free people walking the earth. Legal rights are granted by men, and can be altered or destroyed by changes to law or the structure of government. The natural and legal rights in the Constitution are so fundamental that the Bill of Rights was added as an explicit bar to encroachment from the federal government.
The right to keep and bear arms is a natural right. It can be derived and is protected in multiple ways. Inherently, humans have natural grounds for self-preservation and defense. This right is beyond the reach of any person or government. Individuals can protect themselves using any necessary tools or actions.
Individuals also have a natural right to own property. Far be it for the federal government to regulate the personal items a free citizen enjoys in her home. To regulate personal property in private use on the grounds of its danger would be to inspect every knife, lighter, hammer, gardening tool, and gas-powered stove.