Fusion 1911 Checkered Flat Mainspring Housing, Metal, Black $50.00 Flat checkered mainspring housing, metal, black, for the Colt 1911 (and clones). Made in the USA to exacting standards. MSH-27-19 Out of stock Category: Colt 1911 Related products Fusion 1911 .45acp Ejector, Blue $40.00 Fusion 1911 Ambi Safety, Stainless $125.00