Many of you have been asking for the officers Mainspring Housings to be made in carbon steel and Stainless steel in the Chain-link pattern. So, here they are, our newly manufactured Steel Officers Mainspring housing with the chain-link stippling. Available in Carbon steel with black oxide finish and in stainless steel with matte finish or Brushed polished. Also, available in the magwell versionâ€¦. Thanks again for all your great suggestionsâ€¦..Bobâ€¦ Fusionâ€¦.