Colt 1911 Gov’t/Comm., 18lb mainspring. $13.97 ET111164 Eemann Tech Main Spring for Colt 1911, STI 2011 and clones. 18LB. In stock Colt 1911 Gov't/Comm., 18lb mainspring. quantity Add to cart Category: Colt 1911 Related products Barrel link, #2 (Std -) $19.97 Colt 1911 Slide Lock Tool $59.97