Today I successfully bored out my 6p with a drill, sandpaper, 3/8 drive extension, and duct tape. Just waiting on KD to get me my XML u2 drop in.
Have fun with it!
There are a lot of options with Surefire stuff. And not all of it needs to cost the earth.
Hope you have as much fun with lights as I do.
That is a great drop in, I just wish it was driven a little harder.