No, I haven't done this (yet). Decided to pull my Tikka XP apart to see what made it tick though, and having a play around with some XR-Es I've got it looks like one will fit. The Tikka is kind of pathetic - only 120mA through the LED on high with pretty fresh batteries (450mA on boost though!), but given the Luxeon LED is a Q bin (30-39lumens at 350mA), the XR-E should more than double the light output to make something vaguely decent.
I'm guessing nobody else has tried this mod yet?
I'm guessing nobody else has tried this mod yet?