Stu,
Fit is pretty good, threading pitch matches exactly. I noticed I had to REALLY crank down (two hands) on the bwzel to get the light to turn on, and I think that a smaller thickness o-ring would help in this respect.
For those who often switch on their lights, this makes for rather difficult actuation, but for those who may value a positive "lock-out" feature against accidental switch-on of the light, this above "problem" can actually be a benefit.
/ubbthreads/images/graemlins/smile.gif
Feel isn't bad at all -- it's not like the SureFire HA-III's finely "granulated" surface, but rather smooth, kinda like a MagLite "silver/pewter" light's feel. There's noticeable visual differences in anodization color, but no worse than a HA-III to another HA-III match.
Allen
aka DumboRAT