Ghost ultimate 3.5 trigger kit for glocks gen 1-5 drop-in FEATURES-For Glock Gen 1-4-Drop-in-One Ultimate 3.5 lb. connector-One 6.0 lb. trigger spring-One 4.0 lb. firing pin spring (target/sport configuration)-One 6.0 lb. firing pin spring (self-defense configuration)-One reduced power firing pin safety spring Other Features: Drop-in connector for glock for 3.5 lbs trigger pull includes connector and wolf brand springs for the best possible trigger pull does not fit glock 42/43