The Eemann Tech GLOCK Competition Springs Kit allows you to lighten the trigger pull weight of your GLOCK GEN5The GLOCK trigger pull weight is determined by spring weight and glock connector. INCLUDED IN SET:ET-121005 – Eemann Tech GLOCK Competition Firing Pin Safety Spring for Glock Gen5 (Reduced power) - lightens the work of the trigger mechanism.ET-121020 – Eemann Tech Competition Trigger Spring for GLOCK Gen5 - This spring helps you to pull the trigger easier.ET-121003 – Eemann Tech GLOCK Firing Pin Spring for GLOCK Gen3/4/5 4lbs (Reduced power) -  lightens the work of the trigger mechanism.NOTE:We do not guarantee that the trigger safety will function correctly after installation of whole kit, because its a competition springs.