Thought I would post what I just did to fix some nicks and scratches. Proceed at your own risk! I don't know if this will work on your barrel and you should check to make sure its OK first lol. Take a alcohol pad or alcohol and cotton ball, or anything to remove oils from the area cause your going to be painting it. Mold a moldable ear plug and fit it in your barrel. Then take some tape and wrap it around the barrel wherever you need too to perfectly surround the crown. Now you can spray whatever kind of paint it is you want on the crown to as many layers as you need(I used Krylon), and Viola! Baby skin smooth. Now I cant say If my nicks and scratches were actually hurting my accuracy, but I now have peace of mind lol. Feel free to add to this on your experiences, or ways to make mine better