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how do you like the mount/position of the light?
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I take it you're referring to my photo above? If so...
Pros: Minimizes bbl shadow, minimizes weight, holds light as close to the side of the rifle as possible, thumb rest on scout mount improves retention and controllability, w/light that far forward, my support hand forefinger wants to move to the front lip of the handguard (YMMV).
Cons: Forefinger on the front of the grip can result in finger touching hot metal if front sling swivel & mount aren't removed & felt heat on finger through gloves even if removed. Perhaps it's my fingers and/or technique, but I found it difficult to maintain momentary-on while shooting w/o either inadvertently going to constant-on or the light going out (again, YMMV). Height of light makes it visible in the lower left corner of my MRO's FOV (no hindrance to shooting that I can detect, but still worth mentioning).
What helped partially w/this was moving the scout mount one notch back which improved hand placement w/o worsening bbl shadow (but still difficulty w/switch control):
What I'm experimenting w/now is the light at 9 o'clock combined w/using a vfg (I'm a fan of vfg's but am not married to them). This does create a 3 o'clock bbl shadow and adds 2oz of weight due to the vfg, but retention/control is much improved as is switch control (I have to make a deliberate effort to go from momentary-on to constant-on and I have no problems maintaining momentary-on while shooting) and the light isn't visible through the optic:
Tomac