Our Custom Frame Completion Kit includes all components needed to build your own compact Glock pistol minus the frame. It includes the Shadow Systems Elite Trigger our top-rated flat-faced machined aluminum trigger. Finalize your build with the highest-quality Made in the USA Shadow Systems upgraded parts for your Glock pistol. Compatible with Gen 3 or Gen 4 Glock 19 frames. Shadow Systems Frame Completion Kit includes: Shadow Systems Elite Trigger (flat-faced machined aluminum trigger.)Magazine CatchMagazine Catch Spring3.5 lb ConnectorG19/23/32 Locking BlockStandard-length Slide Stop LeverSlide LockSlide Lock SpringTrigger Housing PinTrigger Housing with EjectorLocking Block PinTrigger PinTrigger Spring (standard weight) Compatible Gun Models: Glock Gen3 G 19 Glock Gen 4 G19