I agree it looks alot like the briley, but those did not look like serrations. I will check with my match director and get his take but this seems awfully silly if clear consensus cannot be gathered from reading the rules.
The question is are these slide serrations or something else?
8.2.2.3 ESP Excluded Features and Modifications (Non-Inclusive list):
A. Removal of material from the exterior of the slide other than front cocking serrations, tri-top, engraving, carry melts, and high power cuts.