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 Colt 1911 Front White Dot Sight, Series 80 $40.00 Fusion 1911 High Impact Hammer, SS $90.00