4 Sevens
I'm pretty sure they DO NOT have a momentary on. But the 4 Sevens Quark 123(2) "Tactical" version does and is a very similar light. My Surefires all have momentary but I'm happier with the size, power and price of the PD20. The PD series allows you to pre-set to "Turbo" mode which means when you flip the switch you have an instant blinding light and that's good enough for me. The PD20 favorably compares to my SureFire Ultra2 at 1/3 the size or less and 1/4 the price. The PD31 would likely be great but with as much stuff as I carry in my pockets, I think the PD20 is the perfect compromise.
Here's a size comparison pic of some of my lights.
L-R: Surefire Ultra2, Fenix LD10, Fenix PD20, Fenix LOD, Kahr PM9 Extended Magazine
I'm pretty sure they DO NOT have a momentary on. But the 4 Sevens Quark 123(2) "Tactical" version does and is a very similar light. My Surefires all have momentary but I'm happier with the size, power and price of the PD20. The PD series allows you to pre-set to "Turbo" mode which means when you flip the switch you have an instant blinding light and that's good enough for me. The PD20 favorably compares to my SureFire Ultra2 at 1/3 the size or less and 1/4 the price. The PD31 would likely be great but with as much stuff as I carry in my pockets, I think the PD20 is the perfect compromise.
Here's a size comparison pic of some of my lights.

L-R: Surefire Ultra2, Fenix LD10, Fenix PD20, Fenix LOD, Kahr PM9 Extended Magazine



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