Of course it’s not a Badger rail….. here’s a picture of one of my FN supplied XP rails, unmarked/no numbering. It appears to be identical to the OP’s rail.
Sounds like your rail is out of spec right? I have a number of SPR’s all with the original rails, and they’re all in spec, some are Near manufactured, others are unmarked, no problem whatsoever with (top tier) ring fitment (USO, Badger, etc)