The new "V8" deep SMO XM-L 8.4V drop-in looked interesting. I'd hoped that with it's 51mm OD lip, it'd be a straightforward Mag C or D drop-in. No such luck... this was a real chore!
There's probably no getting that drop-in into a Mag C. Maybe you can hone the ID of the C neck and grind off all the threads and most of the metal at the base of the reflector and get the base and neck to pair up, but it's doubtful. You'd still have to do most of the mods I did for the Mag D head on top of all that.
As it was, modding the Mag D head to fit this drop-in was a real pain in the butt. I had to...
open up the ID in the main cavity to fit the width of the top half of the reflector
open the ID of the threaded part of the head at the top for the angled part of the drop-in to enter far enough for the lip to sit on the top thread
trim the top thread off so the bezel would completely screw down atop the metal lip and thicker glass lens
You'll notice in the pic above that I also modded the tailcap for 2x26650 cells to work, and modded the switch and pill to use high amperage connectors. This will allow me to disassemble the light quickly and borrow the leads from the host for testing other builds-in-progress. (I don't have a bench supply, so I test/measure using the cells I intend for the build)
I also modded the switch positive contact for use with flat-top cells:
Here's all the modded parts assembled and ready for plug-n-play
Here she is all fully assembled. Looks kinda stock, doesn't it?
Now for some comparisons. That V8 SMO drop-in has surface dimensions that are remarkably similar to the Maglite LED reflector.
Here's a cut-down 1C XM-L mod using the Maglite LED reflector side-by-side with the V8 drop-in modded 2D:
The beam profile similarity between this drop-in and the Mag LED reflector paired with an XM-L is uncanny. If not for the fact that my builds are driven harder, even I'd be hard pressed to tell the difference.
Time for some white-wall hunting. Beamshot comparisons between the two lights below.
On the Left, the Mag LED reflector with the XM-L driven at 4+ Amps on high. On the right, the V8 drop-in on high. Tail-cap measured at 1.16A on high using 2x eOne Moli IMR 26650 cells in series. Current delivered to the LED unknown.
4A+ Mag LED on left, V8 drop-in on right
Mag LED 4A+ on left V8 drop-in on high on right