This Glock Factory Connector 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. FeaturesGlock OEM 5.5 lb connectorListed by Glock as only fitting GEN4, GEN5, and G44 pistols onlyPart number 21 on the Glock Schematic