Try a Dremel w/ sanding wheel if you are that OCD.
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Try a Dremel w/ sanding wheel if you are that OCD.
A wet carbine is a happy carbine. Just like 51% of the population - paraphrasing Pat Rogers.
When I was in the Marine Corps, we were instructed to clean our rifles until there wasn't a spec of dirt or carbon remaining. I didn't know any better at the time, and took that training as gospel truth for years.
When I got out of the Marines and years later bought my first AR-15, I assumed that what I was taught in the Marines was correct. Well...I've come to learn otherwise from various sources.
The minor carbon that you are seeing on the face of the chamber is normal. Don't worry about it. It's not going to interfere with the functioning of the firearm. Focus on keeping it well lubricated. Clean the crap off of your bolt lugs periodically so that you can inspect them for wear.
This is getting to the point of "there aren't stupid questions, only stupid people asking questions".
I think I ****ed up. Before I even made this thread I was briefly using a brass pick to try to scrape it off, and towards the very back of the chamber I see two tiny little scratches. Can't get a picture where they show up well. Yes I know using steel dental toothpicks and such are a no-no, but I thought that brass wouldn't be able to scratch the chrome. I'll take my idiot hat now.
Brass won't scratch the steel. What you're seeing are brass marks like the brass marks left around the ejection port.