Wilson Combat Mainspring Housing V-Grip Full-Size Stainless Steel. Our mainspring housings are fully machined from bar stock with real cut checkering. These high quality housings are a drop-in upgrade for handguns with cast or polymer housings and the same parts used in our custom guns; Fully Machined from bar stock stainless steel with real cut checkering; Low luster glass bead stainless steel finish; Drop in fit for most compact/officers size 1911 handguns. Minor fitting may be required in some guns.Exclusive Wilson Combat round butt design for enhanced concealment and improved grip feel without reducing the hammer spring or drilling a new mainspring housing pin hole. The round butt mainspring housing requires frame reshaping/refinishing after installation.; Specifications for Wilson Combat Mainspring Housing: Manufacturer: Wilson Combat Gun Make: 1911 Platform Gun Model: 1911 Quantity: 1 Package Contents: Wilson Combat Mainspring Housing What firearm models does the manufacturer say Wilson Combat Mainspring Housing is compatible with? The manufacturer says that Wilson Combat Mainspring Housing is compatible with 1911Wilson Combat 92SV: Mainspring Housing V-Grip Full-Size Stainless Steel