No. All firearm parts, such as magazines, clips, bolts, and firing pins, are prohibited from being transported in carry-on luggage. These parts may be included in your checked luggage, and do not need a secure container or airport declaration.
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According to TSA, agents find one firearm for roughly every 116,394 passengers screened at security checkpoints.
Lock your gun case before you and the counter agent take it to be checked by TSA. Stay in the immediate area. If TSA needs the case opened for some reason or has questions, you must be present. At most airports you can stand in an area that provides you with a visual of the space where TSA checks special baggage.
Here's what the TSA says about transporting guns and ammo, in a nutshell: Your firearm must be packed and unloaded in locked, hard-sided pistol cases in your checked baggage. Never attempt to carry on a firearm.
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.
We allow small arms ammunition, in quantities not exceeding 11 lbs.(5 kg) per person, as checked-baggage only. The weapon must be securely boxed and intended for that person's own use. More than one passenger may not combine quantities into one package.