I am sliding into this obsession I built a mod for one of the taggers, it went from being able to mark in a fifteen degree arc, to being able to mark 180 around the front of it. and it auto reloads.
I'd need something more intense than 960 nm diodes for that. edit: I was thinking about integrating noise canceling headphones and a debillitating noise generator into my nephews though.
I did not, they actually use IR, on a 38-40 Khz carrier wave, so lasers, I mean, I suppose one might be able to use an IR laser, but that might be bad for the vision of the people I am playing with. the taggers are on clearance at target, near scheels.