If it is preserved oil, don't shoot it. It will just make it worse.
Ask me how I know....I forgot to clean some brand new barrels with preservative oil.before shooting it. you will just burn what oil and residue even more onto the bore. Looking at the dirty patches coming out from the bore, this is most likely the case. Colt USA likes to dunk their guns in oil, and STAG Arms being a contractor for Colt inherited this practice. I had a STAG years ago they used the same preservative oil, generously.
I will call back and tell the manager this is not acceptable. Next step is to call stag arms. Show them the picture with all the black patches coming out.