No, it doesn't fit that requirement. The gun must be in a hard-sided case. The language of the regulation is clear...
"Firearms must be unloaded and locked in a hard-sided container and transported as checked baggage only."
Transporting Firearms and Ammunition | Transportation Security Administration
I disagree with this. If the unloaded gun is in a sock, as Bugkiller says above, and inside a locked, hard-sided case — with incidentally, a weeks worth of laundry — it is still in compliance with the rule.
I have no interest in getting into a debate with the airline employee at the desk about whether or not I am following the letter of the TSA requirement...
This I agree with. Best to avoid behavior that might lead to confrontations. Foolish to add extra hassle to the hassle of flying. Excellent point, Chubbs.
I just prefer the locked hard case inside the suitcase. It is easier to surreptitiously cut open a soft case and remove contents than it is to remove a hard case. I may be overthinking it, but we have had meds stolen out of luggage in the past, and typically if you lock the outer case it needs to be a TSA lock or you risk it being cut open by TSA.
This, too, is an excellent point. Typically I don't lock the outer case* but do lock, of course, the small, hard-sided gun case within. I also think I recall that the rules say that the gun case should be locked so that only you, and not TSA, can open it. If outer suitcase serving as the TSA-approved gun case, is locked with a TSA lock, or locked with a personal lock, that's potential trouble either way.
*When I flew cross country the last time, Delta zip tied my unlocked soft suitcase lock, plus the entire suitcase.
Respectfully, you can make that argument to the TSA regulatory inspectors who prepare the civil enforcement case against you (which can carry a hefty fine), but I think it's a lot easier just to follow the rules...
Civil Enforcement | Transportation Security Administration
While I am not willing to concede that my "outer case is the hard-sided case" is against the rules, I am heartily in favor of avoiding potential arguments with airlines or TSA employees while traveling.
Thanks, fellas. It was a useful discussion for me. I will stick with the standard "small, locked hard-case w/ unloaded gun inside larger checked suitcase" that I have been using to date.