Colt 1911 Gov’t/Comm., 18lb mainspring. $13.97 ET111164 Eemann Tech Main Spring for Colt 1911, STI 2011 and clones. 18LB. Out of stock Category: Colt 1911 Related products Fusion 1911 2pc Full Length Guide Rod, Commander, Stainless $65.00 Fusion 1911 Commander Hammer, Stainless $75.00