I forget the model number but the scout tail cap is a nice improvement. Gives you the shroud with the button not so far down into the shroud.Before I finished this light I tried it without the tail shroud and found it hard to handle with the light being so tiny with an incan E head. Not really a problem with a bulky LED head.
The tail shroud makes a huge difference for me handling wise. Although you have to poke your thumb right down in there to activate the switch.
Could benefit from a taller boot with a nub inside to close the gap to the switch for an overall taller switch.
Mine is a modern Aviator with an incan E2D head and scout tailcap. I added a #10 plumber o'ring at the tail end for extra grip. I swap between a Lumens Factory bulb and a Tana singLED