From what I understand, if you turn the bezel all the way tight, it will be on high mode, which is what I would use it on, but I'll keep that in mind. I talked to a guy on the phone at Fenix gear (I think), and he acted like it would work fine, so if it doesnt, I dont have to feel dishonest about using the warranty. I switch tail caps between the 2 RC-F4s (before I broke the one), and the problem followed the forward clicky tail cap. My RC-G2 is going good, but it has been behaving itself for the last few days anyways. I'll probably spend a bit more money and get a nicer Fenix with more power to mount on my rifle, but I wanted to try a cheaper one first. I didnt realize the TK series where meant for tactical use while the others werent. Well see.