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.

Variable Power Recoil Springs
    Reduced Power…: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, & 15 Lb.
    Factory Standard.: 16.5 Lb.
Extra Power……..: 17.5, 18.5, 20, & 22 Lb.

42616 – Colt Double Eagle Govt .45 ACP Standard Variable Recoil Spring 16.5lb