Just wanted to chime in and say how pleased I am with my dropin. I'm running it just as Matt intended, with the silver foil, and it's still working wonderfully in my Fivemega 6P body. The light and beam pattern are beautful, and even at 2.66A the lumen output is great. My brother, who is tough-to-please as a Marine can be when it comes to lights, exclaimed over how high the lux was over so wide an area. Definitely turned my 6P into my favorite light, hands down.