I know what I want.  I just don't know the best way to get there.  I want to do this as inexpensively as I can.

1)  I want a weaponlight for my AR that will have the same performance as an M3T

2)  I want to be able to switch from a turbohead to a LED when I want to.

3)  I want to use surefire parts

So do I just buy the above parts, or can it be made cheaper by using other flashlights and building it?  (Like a 9P)

1) I want a weaponlight for my AR that will have the same performance as an M3T
- SureFire's M97 WeaponLight uses the same lamps and TurboHead as the M3T.
I'm not sure what the pricing is on the different options but I don't expect it'll be that much cheaper to "build" your own version. You could just use an M3T but if you want a real WeaponLight...
LM90, KT4, A21, TailCap (Z41/Z48/Z58 etc) and mount.

2) I want to be able to switch from a turbohead to a LED when I want to.
The KL6 directly replaces the TurboHead/bezel on the M3T/M97/LM90 etc

3) I want to use surefire parts
It's possible but I'm not sure it'll be any cheaper than getting an M97.

The standard-body 9P can not accept the Millennium TurboHead (which is shock isolated).

Al

See! Better off getting the real deal.

The KL6 LED bezel directly swaps with the TurboHead.

here is a photo (it's the bottom one)

Al

SureFire's M97 WeaponLight uses the same lamps and TurboHead as the M3T.

You could just use an M3T but if you want a real WeaponLight... LM90, KT4, A21, TailCap (Z41/Z48/Z58 etc) and mount.

Wouldn't it be a lot cheaper to just buy a M3T, tape switch and mount; then the M97?
The M97 retails at $450 vs. $308 for the M3T

Anyone?