does anyone know what will happen if i pollish the out side of the barrell on my .380? the web site says it is made of SAE 4140 ordnance steel, heat treated to 48 HRC. will it rust if i buff it down to a shine? Is there a coating on it from the factory? I'm planning on doing my M&P 40c also, but it has a stainless barrell so i'm not worried about that one.