This Masterlock padlocks are pretty robust. Home Depot/Lowes should have them. The shackle is small enough diameter to fit a Rikers.
I would measure the diameter of the hole a padlock has to go through on your device, then go to a hardware store and look for some the sturdiest lock with the smallest size that will work for you.
Here’s the locks I have. I’ve flown several times with them and have had zero issues with TSA or any airline. Master Lock 131T Covered Aluminum... https://www.amazon.com/dp/B000CSN33G?ref=ppx_pop_mob_ap_share
And here’s the case I use
CASEMATIX Hard Gun Case for... https://www.amazon.com/dp/B086B92H1F?ref=ppx_pop_mob_ap_share
Again zero issues. I have 2 loaded mags in it and use the foam to hide the rounds in the mags(front facing down). They’ll ask you to open your case and show them so they can put in a tag, and give you the “receipt” part of it. They are NOT ALLOWED to touch inside that case in any way shape or form. So they can’t know if they’re loaded or not. Not saying it’s the right thing to do but…