Use a Gray Scotch Brite pad and gently go over the scratches until they fade. This should blend the scratched areas back to the dull satin Stainless steel look which would be the original on most King Cobras. Before you start clean the gun from any oils and look closely to get an idea of which direction the "grain" flow in the Stainless Steel keeping with that same direction. For deeper scratches you may need to use some metal polish then go back to the Gray Scotch Brite as mentioned above to dull the polished areas out. Go slow, don't get in a hurry, and check the progress often. Good luck.