1. Introduction In search of a tactical flashlight, I've been looking at every flashlight brand that has intuitive user operation for their flashlight. As a Nitecore fan for 5 years, I was so satisfied with my old MH25GT, and in my opinion, the MH25GT is the best Nitecore for my needs, with no complicated user operation and a really good thrower flashlight. I'm amazed since the first day Nitecore announced they will be releasing their new product for the SRT series. As far as I know, SRT, or "SmartRing Tactical," is part of the Nitecore flashlight that has multiple led sources or a mode with rotation ring operation for its output. It's been 7 years since their SRT7GT was released, and finally we have the new Nitecore SRT6i, the new 4th generation of the SRT series. The new SRT6i is really a remodel of their predecessor, since it doesn't have multiple LED output, yet they changed it for an intuitive user (no nonsensical UI) interface for a ta...