Recoil Springs for the Double Eagle MKII/Series 90 pistol are the same recoil springs used in the 1911 series pistols. The firing poin spring is different between the two series pistols.

Conventional Recoil Spring Ratings
Reduced Power…: 7, 8, 9, 10, 11, 12, 13, 14, & 15 Lb.
    Factory Standard.: 16 Lb.
Extra Power……..: 17, 18.5, 20, 22, 23, 24, & 26 Lb.

41816 – Colt Double Eagle Govt .45 ACP Standard Recoil Spring 16lb