federal law says 21 to purchase a handgun from a dealer/ffl. You
may be able to buy a handgun from a friend, NOT A STRAW PURCHASE THOUGH!. Dont send a friend into the gunshop for you, or you could both go to jail. May be best to wait until you are 21, buy a shotgun for home defense for now, 20 Ga, or 410 with buckshot
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Marine, Retired LEO, Firearms Instructor, Life Member NRA Tea Party Member, and general all around trouble maker.