I am new to the wonderful world of pistols, and recently purchased a p320 and p938. I took them both to the range for the first time today, and ran through probably less than 50 rounds in the p938. I loved both firearms, but I noticed a gold (or bronze?) streak on the slide of the p938. I'll include a pic at the bottom of the post. I know it is probably nothing to worry about, but I am just curious what could have caused it so I can make sure not to get this beauty all marked up before even breaking it in. All I have right now is some gun oil, and I couldn't clean the streak away with it. Maybe some better cleaning solution would do the trick. The only thing I could think of is it may have something to do with a bullet casing or something. Any idea what it could be from and a recommendation for some good cleaning solution?
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