I got a BAS through airport screening on Jan 3rd, but the bag was never actually opened. (YES, IT WAS CHECKED BAGGAGE!!!)
You should be able fly with K's (guns too) in checked baggage, but that doesn't mean something won't "grow legs". Theft of items from checked baggage has been a problem before, and as far as I know they haven't addressed any sort of policy for theft claims in the new laws. Hopefully, the security background checks that everyone's supposed to go through will have weeded out the convicted felons.
Note, that I flew out of Detroit, which has it's checked-baggage screening right behind the ticketing counter, in full view. I watched my bag like a hawk until it was done going through.
P.S. - ICS - if you're going by plane, or not going to the convention at all, I'd be glad to bring something back for you.