Can I have a loaded mag locked in the case with my gun?
There is no universal answer to this question since it can depend on the airline and even the specific airport. However, as a general rule, it is generally advisable not to bring firearms or gun magazines onto a plane.
There are a few reasons for this. For one, firearms and ammunition can be considered dangerous items that could potentially pose a threat to other passengers or crew members on the plane. Additionally, in the event of something going wrong (a baggage handler mishandling your luggage, for example), having firearms and ammunition in your carry-on baggage could lead to serious delays or worse. For these reasons, most airlines prohibit passengers from carrying firearms and ammunition onto planes.
If you are planning to travel with firearms or gun magazines, it is best to check with your airline beforehand to see what their specific policies are. Additionally, it is always a good idea to pack these items in your checked baggage rather than take them on the plane with you. This will help to ensure that they are properly secured and less likely to cause any problems.