1. Short title This Act may be cited as the 21 to Buy Act . 2. Increase in age at which a rifle or shotgun may be acquired from a federally licensed firearms dealer (a) In general Section 922(b) of title 18, United States Code, is amended— (1) by striking paragraph (1) and inserting the following: (1) any firearm or ammunition to any individual who the licensee knows or has reasonable cause to believe has not attained 21 years of age, unless the individual is— (A) a law enforcement officer; (B) a correctional officer; (C) on active duty in the Armed Forces of the United States, or full-time duty in the National Guard; or (D) a member of the Armed Forces of the United States or the National Guard who possesses or is armed with a firearm in the line of duty; . (b) Conforming amendment Section 922(c)(1) of such title is amended by striking , or that, in the case of a shotgun or a rifle, I am eighteen years or more of age and inserting or am a law enforcement officer, a correctional officer, on active duty in the Armed Forces of the United States or full-time duty in the National Guard, or a member of the Armed Forces of the United States or the National Guard who possesses or is armed with a firearm in the line of duty . (c) Definitions Section 921(a) of such title is amended by inserting after paragraph (29) the following: (30) The term law enforcement officer means a person— (A) who is elected, appointed, or employed by the Federal Government or by a State or political subdivision thereof; (B) who is vested with authority to bear arms and make arrests