Nighthawk Custom’s FM Series 1911 mainspring housings are the perfect way to improve the handling and appearance of your 1911 pistol. Fully Machined™ from solid 11L17 carbon steel, these high-quality housings are the best 1911 parts on the market, offering an instant upgrade with near drop-in ease. This 1911 mainspring housing features 25 LPI serrations to improve purchase on the pistol.
*Gunsmith fitting may be required
The Nighthawk Custom line of Fully Machined parts are designed to be the gold standard in the 1911 parts industry. All Fully Machined parts have been fully CNC machined from solid steel billets. We never use cast, metal injected moldings or polymer parts. In order to create the World’s Finest 1911s, only the best materials can be used. That is why you can trust Nighthawk Custom Fully Machined parts in your 1911.
All Fully Machined parts are backed by a lifetime warranty.
- 11L17 Carbon Steel
- Flat (Straight) Back
- For Use on Officer Size Frames
- 25 LPI Serration Grip Texture
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