I thought the same thing until I looked into it...
http://www.surefire.com/personaldefense2.htm
The same two Lamp modules; P60 & P61 are used by both flashlights, but I'm not sure if the D2 has both...
The D2 is a new 6P with LockOut TailCap; It is more water resistant than the 6P, but not waterproof, & has a pocket clip which helps to stop the sleeker new design stop rolling.
The M2 is the Millennium version of the 6Z with LockOut TailCap, Military Level III Hard anodizing for extreme toughness, durability & electrical isolation. It has a CombatGrip & pocket clip. The Lamp bezel is not round, so it'll stay where you put it. The M2 is fully waterproof, so can be used at depth underwater. It can also be used in Methane-rich or explosive/corrosive atmospheres without damage to internal components.
I would strongly suggest as with all flashlights, make sure the "o" rings & seals aren't broken or dirty before use. Use a little silicon grease, & replace the "o" rings at the 1st sign of wear. Check the seals after exposure to CH4 & other gases as the seals may be damaged after prolonged exposure. Clean the flashlight after submersion. Treat it like a gun or any other tool - with respect. It could help save your life.
So, the M2 is the toughguy flashlight, whilst the D2 is for those who don't need all the added features.
The Lamp Modules are the same, as are the runtimes.
I am getting an M2 myself. I don't mind paying that bit more for the best. (not that I'm a toughguy, I'm just accident-prone!)
The same goes for the M3 and the D3, I'm also getting an M3, although the M3 is far, far more advanced than the D3, and brighter with shock-isolated Millennium Lamp Modules.
I hope this helps.
I suggest you visit
www.SureFire.com, & the forum there is most informative.
Please take what I've said as a guide only. Talk to SureFire, they KNOW what they're talking about!
Alastair
<FONT COLOR="#000000" SIZE="1" FACE="Verdana, Arial">This message has been edited by Size15s on 10-20-2000 at 05:57 PM</font>