if its flaking off Its not cerakote, NEG the guy
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Looks like it was set up for suppressor, have you tried it suppressed? If it will run suppressed, it could be either a misaligned gas block or adjustable gas block turned down too low. I know you said it didn't have adj gas block; but some of them have the controls on the back. Check the hammer spring for the light strikes and make sure it is installed correctly and also not a "light" one to improve the trigger feel.
Light primer strikes, FTEWhat function problems does it have ?
The BCG looks basically newLight primer strikes are either hammer or hammer spring usually . How is the condition of the ejector ? I would say replace that and go from there