Hellfighter lights are JUNK!
The first one I bought broke the first time I pushed the switch. Its replacement squeeks when the switch is pressed.
The machinging quality is pitiful - the threads feel like there is sand in them.
The O-rings are very low-grade.
The light is greenish and not very bright.
The included batteries were made in China (no mention of where the light was made).
Here is a closeup photo of the threads (complete with dirty factory grease).