So I ended up picking up a cheap FG rail, damaged packaging, score.
It's visibly lower then the Nagisa in my car currently.
I'll be installing with measurements to verify just how much this Saturday, but I can now with confirm Nagisa rails no longer mirror FGs as people used to report.
I've purchased the Nagisa system in 2009, another in 2011, and finally this one in 2016. The design definitely changed in late 2011. The profile is parallel to the ground instead of leaned back like the Bride FG and Street Faction rails.
Street faction was a close second, but I wanted to retain sliders.
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