psychbeat, I was thinking along the same lines as you. 18650 power, maybe 2 IMR 18350's if needed. It seems to me if the price was right (~$100 maybe $150?) a lot of people would be into one of these. I have some great old Surefire hosts that mostly just sit there, I've got more hosts than good LED drop ins and a laser module in a C2 or M2 would just be nifty. I have a cheap eBay laser that I fire off every so often, just thought it would be nice to have a cool laser in one of my unused hosts. M4a1usr, that is what I had in mind too, a nice copper drop in with the laser goodies in it. I'm unfamiliar with power ranges but something dangerous and on the fringes of legality always appeals to me. My current laser is green and I enjoy the high visibility of the beam, even in daylight.