Walking Dead
Member
I don't know if it's a secret but this is something Ruger has used in the past for smooth finish on parts.
http://www.remchem.com/page3-53/TheISFDifference?gclid=CPumhsfq6KwCFYhdTAod5yF3oQ
http://www.remchem.com/page3-53/TheISFDifference?gclid=CPumhsfq6KwCFYhdTAod5yF3oQ