+1 for the Gear Sector offset light mount, I've been running one for a few years now and just got a new one for my Fury Defender- lumen upgrade from my previous light. Puts the light in a perfect spot for my thumb although I'm running a magpul AFG and no pressure pad so you probably will not be worried about that. Looking at your setup and railspace an offset mount makes sense, more room by moving your pressure pad cording up out of the way giving you easier hand placement. I imagine if you got big meathooks like myself your probably fighting with the back of that light alot.
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The mount is high quality & rock solid and once I installed it I've never had to mess with it, never has come loose, and I reef on that thing when practicing. It's simple and it looks good and does not take up alot of room on the rails, you really can't go wrong if you go with one. Also GS customer service is awesome, JTrusty's the man.