Wilson Combat designed a flat recoil spring for the compact 1911 models chambered in 38 Super. Compact handguns are notorious for being hard on recoil springs and the factory spring can quickly take a set, reducing reliability. This recoil spring set replaces the traditional coil spring design and greatly enhances the overall reliability of your carry gun. This drop-in kit can be easily replaced in without any kind of specialized tools or gunsmith work.Kit Includes:Stainless Steel full length guide rodHardened stainless steel reverse spring plug15 lb. Chrome silicon flat-wire recoil spring