PiratePast40
Single-Sixer
You might want to try a new guide rod assembly and see if that fixes the problem. They're only $5.
http://shopruger.com/VS02060-100-SR9c-SR40c-Guide-Rod-Assembly/productinfo/63036/
http://shopruger.com/VS02060-100-SR9c-SR40c-Guide-Rod-Assembly/productinfo/63036/