I had it mounted like that so the entire flashlight mount would fit flush. However, I was able to move it one slot forward and still mount the flashlight, even though the flashlight is now sticking one slot off of the front of the rail. It shouldn't be an issue for the shooting that I do. And, if for some reason, SHTF (not that I think it will), it will work in a pinch.
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S&W M&P 15 Sport II
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