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I ended up getting a "Solar Force L2P Flashlight Host for 18650 HA III Black Finish" and a lighthound drop-in. I'm going to end up with a Malkoff m61 later.
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I've a couple L2m models. You can add or subtract 34mm at a time for as many cells as you like to use.
McClickie switch is a great option and if you like the zero resistance button will work as well.
In a standard 6P 17670s will work but for more money you can get them already drilled out for 18650s.
Lumensfactory warm drop-in puts out a couple hundred lumens and actually fits Surefire 6P/Z2 better than Malkoff.
Malkoff fits VME head in E2 perfect.