We proudly use ISMI springs in all of our builds and component assemblies.  Over the years, we have spent a lot of time switching back and forth between spring manufacturers for our builds before finally making the decision to stick with ISMI.  The longevity and consistency of their springs has proven to be unmatched.
 
ISMI firing pin safety plunger springs are designed to either replace worn out factory parts or help tune the firearm with improved trigger feel while maintaining safety standards.
 
Manufactured of Chrome Silicon alloy, these springs are designed to help tune the trigger pull of the Glock platform.