Ed Brown Products Firing Pin Spring 1911 Heavy Duty Steel. The firing pin spring should be replaced every 3000-5000 rounds. Specifications for Ed Brown Products Heavy Duty 1911 Firing Pin Spring: Manufacturer: Ed Brown Products Color: Steel Gun Model: 1911 Package Contents: Ed Brown Products Heavy Duty 1911 Firing Pin Spring What firearm models does the manufacturer say Ed Brown Products Heavy Duty 1911 Firing Pin Spring is compatible with? The manufacturer says that Ed Brown Products Heavy Duty 1911 Firing Pin Spring is compatible with 1911Ed Brown Products 908: Firing Pin Spring 1911 Heavy Duty Steel