Since I adore talking to TSA, as I just started my SCI pilgrimage, getting off my Kenai puddle jumper and checking in with Alaska Air in Anchorage, I decided to just flat out ask the guys at the TSA booth that check in a LOT of firearms everyday.
Their take, TSA does NOT have a policy on what type of lock for firearms. They do for baggage. For firearms the standard a recommended practice is secure (non-TSA) locks. Which is why the new protocol for airports with the new scanners is to have owners stand by or if entering through airport security, to keep an eye on their phones for 10-15 minutes in case TSA needs the owner to open a case. Salt Lake and San Antonio I know for sure follow this protocol from personal experience since September of 2025. Denver Airport has the new scanner, but at least as of early 2025 had a porter accompany the owner to the TSA office for scanning and waited on the other side of a big thick glass while scanning. If they need in, you are there, once you get the thumbs up, you are released to go about your way through security. None of that protocol would have a purpose if they required TSA locks on firearms.
I even politely challenged the two TSA guys a moment ago, that some of my hunting brethren says they are wrong. They chuckled, said something to the effect of being all baggage certified for 10+ years a worked multiple airports, the other guy said he trains folks on their protocols and procedures….no directive on the type of lock between TSA or non-TSA traditional. Just that Delta wants a lock penetrating every hole, no hole unlocked, which isn’t their standard, but no more and a finger or two squeezing in if trying to open with it locked, if they can reach 2 or more inside while locked, then need more locks, shorter shackles, stiffer case or multiples of those.
They both said when traveling with a weapon they use old fashioned keyed master locks. I didn’t ask why MasterLocks.
So there’s the story from the horses mouth, if we can trust it. All I know for sure is I’ve flown with a firearm within the US no less than 3-5 times per year for the last 15-20 years, some well more. Always, every time, plain non-TSA lock. I’ve only been to Africa 4 times now since 2024 and once to Mexico with firearms, again, each and every time a traditional, keyed, non-TSA locks. Never an issue.