SpecificationsBuild: Full Metal ConstructionFunction: Upgraded 9Mm BushingsCompatibility: Most 9Mm GearboxesColor: SteelManufacturer: 5KuFeaturesFunctions Smoothly And Reduces FrictionExtremely Durable And High QualityWorks Perfectly During High Rates Of FireA Great Option As An AEG Gearbox UpgradeDesigned To Be Compatible With Most 9Mm GearboxesImproves The Operational Smoothness Of The GearsProfessional Installation Recommended Improves The Workings Of Your Overall GearboxTakes Stress Off The Motor And Reduces Battery ConsumptionBushings Are Not Compatible Version 9 Gearboxes