Pistol cases can be put inside other checked luggage; long guns need to be checked in individual bags. Be certain to remove any detachable magazines, and check twice to ensure that the gun is unloaded. A limited amount of ammunition can be checked in the case alongside the firearm or separately in your luggage, but it must also be packaged per TSA regulations. The easiest thing to do is to keep ammo in its factory packaging. Don’t forget any loose rounds in pockets or packs. You don’t have to use TSA locks to secure your gun case, but they do make life easier. Ensure that there are no potential access points into your case, particularly if you’re using a plastic case, which has corners that can be pried open. When in doubt, add another lock.