Enhance your 1911 pistol's performance and aesthetics with Nighthawk custom's FM series 1911 Mainspring housings. Expertly crafted from solid 11L17 carbon steel, these Fully Machined components represent the pinnacle of quality in the 1911 parts market. Designed for seamless integration, they offer a straightforward upgrade with minimal installation effort. The mainspring housing is meticulously engineered with 25 LPI checkering, ensuring a secure grip and improved handling. Nighthawk custom's commitment to excellence is evident in their fully-machined parts, which are precision CNC machined from solid steel billets, eschewing cast, metal injection molding or polymer alternatives. This dedication to superior materials and craftsmanship ensures that only the finest components are used in the creation of the world's best 1911s. Trust in the durability and reliability of Nighthawk custom's fully-machined parts, all of which come with a lifetime warranty for your peace of mind. Flat (straight) back For application on government-standard frames 25 lpi checkered grip texture