I travel internationally with guns to exhibit in the USA in my checked luggage several times a year and use purpose built flight cases.
When I first started doing this I was told by TSA to use their locks to save them cutting them off for inspection if I was not accessible.
However I soon found that the TSA rule is that you SHOULD NOT use TSA locks as everybody and his dog has a key to fit! I therefore use cheap (keyed alike) brass padlocks which can be cut off at minimal cost if they so wish. I also carry a few spare locks and plenty of keys to give to TSA.
TSA operatives don't appear to give a rat's a*** what locks you use as long as they can get in the case when they want to inspect.

Last edited by Toby Barclay; 10/15/18 03:42 PM.