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I find it difficult to see how a coating of oil would increase the pressure inside the barrel anywhere close to what the charge in the ammunition would. I suppose if you filled the barrel up with oil and shot straight up it might be a problem. I know I have shot a MAC10 with oil coating the barrel and for the first 10 rounds or so there was more flash from the barrel. I suppose oil that burns off could leave more residue that powder alone, so the gun would get dirtier, but I usually just run one final patch through the barrel after cleaning. I also work the action 3-5 times to work the oil around. I guess this could leave more in the chamber since I don't wipe it afterward.