Surefire KM2 question

I think I know the answer, but will a KM2 head fit on a WG6D body? It doesn’t appear that it will, but I’m not up to speed with Surefire tube diameters.

Basically what I’m asking is there a cheaper way to use the KM2 head without buying a scout?

I realize I can buy the Viking Tactic’s model & buy the KM2- thats a little cheaper but then you still need a tape switch. Maybe I’ll just go this route.

TIA.

The Surefire executive uses the same body as the scout. Might be able to get on cheap on ebay.