Iver Johnson IJ1911MSH 1911 Mainspring Housing 45 ACP Black Steel

The Iver Johnson 1911 Mainspring Housing is a direct-fit replacement mainspring housing for 1911-pattern pistols chambered in 45 ACP. Machined from steel and finished in a durable black oxide coating, the housing matches the factory profile of a Government-size 1911 frame and accepts the standard 1911 mainspring and mainspring housing pin.

Sold as a single service part under Iver Johnson part number IJ1911MSH, this mainspring housing lets a builder or gunsmith replace a worn, damaged, or upgraded housing on any 1911-pattern pistol. The low-glare black oxide finish is wear resistant and pairs cleanly with both blued and parkerized Government frames, and the part installs with standard hand tools using the existing mainspring housing pin. Overall dimensions measure 2.30 x 2.30 x 5.85 inches.