Wolff's TYPE D 20 lb. recoil spring is designed for .45, .38 Super, or 9mm 1911 Auto in the Commander model, ensuring reliability and longevity.
This spring includes an extra power firing pin spring to maintain the firing pin stop and prevent firing pin float, a feature recommended by pistolsmith Bill Wilson.
The TYPE D spring is an extra power option for hardball and heavier loads, providing the same benefits as Type C but tailored for the shorter Commander with a standard 18 lb. spring.