Ready To Install; Hard Black Oxide Finish
Don’t put a worn or dinged mainspring cap back in your gun when replacing the spring or mainspring housing. This cap is precision machined from high-grade 4140 carbon steel, then heat-treated for extra hardness to ensure secure, reliable spring retention. Durable, black oxide finish adds strength, surface wear resistance, and corrosion protection. Factory original part for STI 1911 and 2011 pistols.
1911, Issue:11, Page:020
Big Book Catalog, Issue:68, Page:120
Sinclair, Issue:1A, Page:019
SPECS: 4140 steel, matte black oxide finish.