I'm a lefty, if that helps it make more sense. I tried both that and having the modbutton directly on top where the offset rail is attached, that also worked. I also tried a surefire tapeswitch on the top rail, basically over the backup irons because it is easily removable if I ever needed them. Still a bit high for my tastes.
I figured the lefty part
I wish their mlok button mount wasn't a slot and a half long and fit at the 12' oclock on the forend.