This is a spring kit that that will come in handy. It has two standard recoil springs, an extra power spring for +P, a reduced power hammer spring, and an extra power firing pin spring.
Specifications and Features: Manufacturer Part Number: SP0400 Spring Kit Commander Make: 1911 Model: Commander
Kit Includes: 2 - Standard Recoil Springs 1 - Extra Power Spring for +P 1 - Reduced Power Hammer Spring 1 - Extra Power Firing Pin Spring