TL;DR - XOS, XOS-H Railscales fit on the KAC URX 4rail.
I wasn’t sure where to put this so hopefully this is the correct place. MODS, if not, please feel free to move.
Railscales website says they do not fit the URX4 rail. They DO FIT with no gaps. Install just like you would any mlok item. Go slow and start low on your torque. I started at 15 inch pounds and stopped at 25 inch pounds. Recommendation from Railscales is not to go over 26 inch pounds as the scales will crack.
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