It's the head itself - under recoil the thing thinks you've double tapped the tailcap to nudge it to a different output setting. A new illum module (bezel/lamp assembly) unfortunately is the answer to that question.
To be honest, I'd just make the E2D your walking around light, and then run a different light as a weaponlight (if you want to recycle the mount, just get the VTAC L4, and hot-swap the tailcap and illum module and you'll be done - that's what I did with mine.
As far as why the scout costs what it does - I was discussing with with Rackham1, but the reason the Scout costs so much is because it is the premier 'buy one light that will work' solution, making it the go-to NSN option (if the user can tighten a thumbscrew, they can run the light correctly), the mount is adequate for use even on MMG's, and as a result the Scout line is the first to benefit from the R&D SureFire is putting towards improving stuff for future .gov contracts (e.g. the High Output illum modules, the Vampire White/IR updated units, etc.).
Same with the tailcap - it comes with a very good clicky tailcap, as well as a pressure switch. It's not the SR07 one, which is excellent, but it's a good, working one. Basically the overall package covers the needs of an individual user pretty well, with flexibility they may not realize they even need, and at a durability/form factor that is helpfully overkill.
I have two of the scout lights, and I really like them both, especially with the superlative GearSector offset mount; but if I'm running a really smooth shooting, heavy, suppressed AR then I have little doubt that the same make of E Series mount with the VTAC light in it will hold up just as well. Running tubular lights at 12:00, I want narrow ones. So, if I want one set of the feature set advertised in by the Scout (KX1/2 illum module, Z38 tailcap, the thinner main tube, and ability to attach an SR07 pressure switch) then the VTAC is the cost-effective approach.
If I don't care about the thin-ness of the light, and not as partial to the Z38 tailcap, then the G2X and Fury become the most value in weaponlights - in a good mount they'll do the same job, and cost a ton less.
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