Wilson Combat Spring Firing Pin Return Package of 6. These enhanced chrome silicon steel springs resist taking a set even after thousands of compression cycles for improved performance and reliability over standard music wire springs. They are the top choice of competition shooters seeking the longest in spring life.; A 1911 Firing Pin Return Spring should be replaced every 5000 rounds.; Specifications for Wilson Combat Return Spring Firing Pin: Manufacturer: Wilson Combat Gun Model: 1911 Package Contents: Wilson Combat Return Spring Firing Pin What firearm models does the manufacturer say Wilson Combat Return Spring Firing Pin is compatible with? The manufacturer says that Wilson Combat Return Spring Firing Pin is compatible with 1911Wilson Combat 974: Spring Firing Pin Return Package of