Ordinarily I agree 100% FM, but like xxo said while I was typing in the case of the ML25 IT Maglite chose to punch a a very narrow hole in the reflector. Much like Streamlight used to do with the TL lights. So a wee bit of blister occurs next to the bulb when using hotter than 2 or 3 cell bulbs. The hotter the bulb the larger the area that blisters. Kinda scary at first but it does not end up affecting the beam over time as the initial blistered area doesn't expand much.
The way I got around that was to drill out the 1/4" hole in the reflector with a 5/16" bit from the front then carve out a 3/8" hole by hand with a drill bit. I started out drilling out that extra 16th inch, ran it a few minutes and removed the reflector to feel how hot it got. It was pretty warm but not as bad as factory. The additional 16th" to make it total 3/8" when checked was nice and cool. Not completely cool mind you but after a 5 minute run it was hardly warm.
Before drilling it.
3 cell model using 18650's and a TL3 bulb. Note melted foil around the edges and how close the bulb is to the plastic.
After drilling.
The gap does not affect the beam at all. I had not sanded the edges of the hole when the photo was taken so you see some ugly edges.
The beam after drilling
A reflector after sanding the edges.
Nice and clean factory look.