What is this mark on my new Colt

Looks like the brass is hitting when ejecting.
yeah, what i would say. i bought a colt sxe a few years ago and the brass ejected back into my face. some would bounce off the slide in the location you show and leave brass marks. the ejector needed a tweak. i just called lew at bec from the range and brought it right in. he adjusted the ejector to where it should have been. he had it 2 days which was better than sending a new gun back to colt for 2+ weeks...but warranty from colt would have cost nothing. lew cleaned up the marks so you'd never tell there was an issue.
 
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