This replacement part 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. Note: The 8.0 lb connector is marked with a (+). This is the connector for users appreciating hard "dry" trigger action. It is also characterized by a clearly sensible point of depression.