"Firearms or ammunition" are allowed in checked baggage, but "billy clubs, nightsticks, and nunchuks" are too dangerous!
My experience is the other way around.
Last spring I was visiting a large live role playing event with some particpants in metal chain mail and armor carrying steel swords. No problem with LEOs.
But there were also some dressed as Star Wars storm troopers carrying plastic storm trooper guns. Those guns were confiscated because they looked to much like real weapons!