Well, first off... the Pelican M6 and the surefire M6 are 2 completely different things... COMPLETELY!!
The surefire m6 is is over $300 and uses 6 123a batteries, and the LED head for that is the KL6.
The Pelican M6 is a 2x123a battery light, along the same lines as the brinkmann maxfire and the Surefire G2, and 6P.
I am having a hard time figurin' out which light you are thinking of.
I think you have combined a few of these lights,
#1 The Pelican M6
#2 The Pelican M6 LED
#3 The M6-R, a surefire M6 made regulated and rechargable by a CPFer named JS
#4 The PK-2, a custom ONE of a kind Surefire M6, with an X-binned Luxeon 5 LED.
Here is a Surefire M6
Here are Pelican flashlights
Here is the thread on the Surefire regulated rechargable, M6.
I have not had an hands-on time with any of them.
SS