Although I find tracer units to be interesting, and to add a almost "realistic" edge to the sport; they don't really work unless everyone runs them. I've seen a few at milsims, and all it does is give away the operators position. The great thing about the dark, is that no one knows where you are. Unless of course they run NVGs with IR, or thermal.
As far as hits being called in the dark, I don't often see a problem. It's usually quieter at night, and people only shoot at sound or movement. So a gear hit is very audible in the dark. In fact, you can hear someones gear hit from far away. Also, when people get shot and don't know where it came from, they tend to call their hits. Or suffer spray from the darkness aimed at their northern region.
I'd love to run a game where they were mandatory. But I'd for sure not be the only one running one at a game. White BBs are easy enough to see in almost any ambient light anyways. It's not like you can't trace your shots. In the dark though, you can only see the BBs for one hundred feet or less I find.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē