SPECIFICATIONS:Brand: KAK IndustriesModel: AR-15 4" 9mm QPQ Nitride Fat 1-10T BarrelPlatform: AR-15Classification: PistolCaliber: 9mm Luger (9x19)Length: 4Handguard Compatability: FreefloatProfile: FatTwist Rate: 1:10Finish: NitrideMaterial: 4150 Chrome Moly VanadiumThread Pitch: 1/2x36