This Glock Factory Trigger Housing with Ejector and Trigger Spring for the Glock 42 and 43 is a factory original from Glock. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation. Some parts may need to be installed by a qualified gunsmith. NoteFits Glock Gen 1-4 Models 42 and 43