[Bren]

I did one cerakote job, on a 1911 .22 I built. Ended up blasting it back off and parkerizing the frame because Cerakote just builds up too thick. You need a a skilled finisher to get it right. I skipped the super important step of straining out the lumps through a filter and ruined my job. Also, lumps aside, I just got it too thick in spots like the trigger ways, so my trigger wouldn't reset.

In this case, the gun probably just needs some work on a trouble spot and it will work again. Your pictures aren't enough to see it, but I suspect the ejection port area is tight where the barrel locks to the slide. (assuming the guy didn't spray a bunch of cerakote on the slide rails).