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Just printing mine out now, it strikes me that you could probably have something like just an endcap that goes in the connector on the end of rail 2 instead of a full rail 3. There's not really much of an advantage there over having a full 3rd rail, but I guess it keeps it more open for further adjustments, like if I decided for some reason that I wanted 2 rail 2s and a shotgun rail, I wouldn't have to do away with that whole rail 3, just the endcap.

Bit of a strange thought but I figured I might as well share it.