Complete OEM spec lower parts kit is made for the Glock 19 but will also work with Polymer80. OEM Glock locking block is not included. Polymer80 frame kits ship with their own locking block. Kit Includes: Connector Extended Slide Stop Release with Spring Locking Block Pin Extended Magazine Release (Glock 17/19) Magazine Release Magazine Release Spring Slide Lock Slide Lock Spring Trigger Housing Pin Billet trigger Housing with Ejector Trigger Pin Trigger Spring Trigger with Trigger Bar