Ghost standard 3.5 trigger kit for glocks gen 1-5 drop-in FEATURES:-Ultimate 3.5lb Drop-in connector-6lb Trigger spring-4lb Firing pin spring (Target/Sport Configuration)-6lb Firing pin spring (Self Defense Configuration)-Reduced power firing pin safety spring-Please Note: The 4lb Firing pin spring may cause light primer strikes in some pistols-For Self Defense or in a 10mm/45 caliber Glock we recommend the 6lb firing pin 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