Actually, Congress once did require people to buy

Posted by Sir Four at 11:00pm Mar 30 '12
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a gun. The Second Militia Act of 1792 required white males to own a musket or rifle, and relevant supplies.

Text:

Be it enacted by the Senate and House of Representatives of the United States of America, in Congress assembled, That each and every free able-bodied white male citizen of the respective States, resident therein, who is or shall be of age of eighteen years, and under the age of forty-five years (except as is herein after excepted) shall severally and respectively be enrolled in the militia, by the Captain or Commanding Officer of the company, within whose bounds such citizen shall reside, and that within twelve months after the passing of this Act. And it shall at all time hereafter be the duty of every such Captain or Commanding Officer of a company, to enroll every such citizen as aforesaid, and also those who shall, from time to time, arrive at the age of 18 years, or being at the age of 18 years, and under the age of 45 years (except as before excepted) shall come to reside within his bounds; and shall without delay notify such citizen of the said enrollment, by the proper non-commissioned Officer of the company, by whom such notice may be proved. That every citizen, so enrolled and notified, shall, within six months thereafter, provide himself with a good musket or firelock, a sufficient bayonet and belt, two spare flints, and a knapsack, a pouch, with a box therein, to contain not less than twenty four cartridges, suited to the bore of his musket or firelock, each cartridge to contain a proper quantity of powder and ball; or with a good rifle, knapsack, shot-pouch, and powder-horn, twenty balls suited to the bore of his rifle, and a quarter of a pound of powder;