Firearms and Ammunition - As introduced, lowers the age requirement to obtain an enhanced or concealed handgun carry permit or lawfully carry a handgun in public from 21 to 18 years of age; states that the statutory authorization to transport or store a firearm or firearm ammunition in a motor vehicle under certain circumstances does not apply to a person under 21 years of age in a parking area that is owned, operated, or while in use by any school, unless the person is at least 18 years of age and meets certain military qualifications. - Amends TCA Title 39.