This Iver Johnson mainspring housing is a flat, blued steel replacement for Government and Commander size 1911 pistols. It has vertical serrations for grip. It does not include internal parts, and some fitting may be required. The title lists .45 ACP.
- Brand: Iver Johnson
- Part number: IJ1911MSH
- Fits: Government and Commander 1911
- Style: flat, vertical serrations
- Material: steel, blued
- Internal parts: not included
- Installation: fitting may be required
