Ghost Inc combined the polished 3.5 LB. Drop-in Connector Trigger with four premium springs. Fine tune your trigger pull, feel and weight all in one kit!Ghost combined all the parts necessary to give you best trigger pull possible. You save a few bucks and get everything in one shot! Includes5 LB. Drop-In Gen 1-50 lb Trigger Spring - This spring is not used in the Gen 5 Glocks- Purchase 25% Return Spring0 lb Firing Pin Spring (Target/Sport Configuration)0 lb Firing Pin Spring (Self-Defense Configuration)Reduced power firing pin safety spring NotesThe 4.0 lb Firing Pin Spring may cause light primer strikes in some pistols this is the Target/Sport configuration.All trigger kits include the target setup and self-defense set upDISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.