After dozens of security checks over recent years, on one of the checkpoints my buddy got the third degree about his arms.
I sometimes think its pretty random, what they pick up on. Mostly it just feels like they are gonna find something just to wag their finger at you. I swear the same person got upset with me the time before (she was pretty memorable) about a charger in my kit but not about the arms.
I wouldn't let it stop me. just be prepared to unpack and show ... not had anything confiscated, even though I get stopped most security checkpoints.
btw, I carry-on enough kit to be able to shoot when I get there. Seen too many friends with luggage go AWOL ... and ruining their trip!

Lndr