http://www.tsa.gov/traveler-informat...and-ammunition
Firearms and Ammunition
Traveling with Special ItemsShare on emailShare on facebookShare on twitterShare on linkedinShare on diggShare on deliciousShare on redditShare on stumbleuponShare on google_plusone_shareTravelers may only transport UNLOADED firearms in a locked, hard-sided container as checked baggage.
All firearms, ammunition and firearm parts, including firearm frames, receivers, clips and magazines are prohibited in carry-on baggage.
Law Enforcement Officers: There are certain limited exceptions for law enforcement officers who may fly armed by meeting the requirements of Title 49 CFR § 1544.219. Please read our policies for law enforcement officers traveling with firearms.
The term firearm includes:*Please see, for instance, United States Code, Title 18, Part 1, Chapter 44 for information about firearm definitions.
Firearm magazines and ammunition clips, whether loaded or empty, must be securely boxed or included within a hard-sided case containing an unloaded firearm