Material corrosion resistant steel mil-s-81591, comp ic-322a type 17-4. Omit paragraphs 3.5.2, 4.2.2.1, 4.2.2.2 and 4.2.2.3; all cast surfaces to have a 125 microinch finish; consists of 1 guide, element fwd p/n 175f605; 1 guide p/n 175f605-1; 2 insert p/n ms21209-f1-15