1911 Mag-well Mainspring Housing, Government, Stainless Steel, Chevron Design - Silver, Fusion Firearms, 1911 Chevron Mainspring Housing Mag-Well in Stainless, Silver Finish. These are Top Quality Professional Series Parts; Made from the best materials and processes available in today's market. 2 piece Dovetail base well with set screw. All Machined from Stainless Steel Bar-Stock and great looking and feeling plain back pattern. These are as nice as they get. Will work for full size and commander size 1911 pistols.