At least in my experience in the USA, the risk to you is probably low, but keep in mind there is a non-zero chance that a TSA agent won't like how you look, how the flashlight looks, the attitude of the passenger in front of you in line, or what their spouse made for breakfast. Once they decide they don't like something, your appeal process does not exist, and you have to choose between throwing away the item, getting out of line to mail it, or not flying. I don't take anything on an airplane that I'm not willing to have taken away by an arbitrary and capricious agent who makes an un-challenge-able "risk-based judgement." That said, I've only had a "tactical pen" and a small pair of pliers stolen by TSA in my last few hundred flights, and never a flashlight; and, I've carried the same pen and pliers (and multiple lights) on every flight before and since.