1911 Springs tend to relax over time, especially with a lot of hard use. Having the best quality springs for your 1911 is important for reliable function, whether on the range or on the street. This Nighthawk Custom 1911 Spring Kit includes most of the springs you will need to build, or re-build, your pistol right.This spring kit includes two standard recoil springs, an extra power recoil spring for +P loads, a reduced power hammer spring (mainspring), and an extra power firing pin spring..