I'm more of a gun guy than a flashlight guy, but I've got a Surefire Z2 with a Malkoff and it's awesome. I've ordered another Malkoff M60 and wondered if there would be any problems running it with a Nitrolon? Wondered really about the heat issues of the polymet body versus a metal body? Also, are there any 3 cell flashlights bodies that i could use the M60 with? The extra inch or so should be no problem and I'd get additional run time. I dont' have to buy the CR123 batteries, as work furnishes them, if that matters. I'm learning a lot on here, but have a long way to go.