The LBE 4 Position Buffer Tube Kit provides everything needed for a complete buffer tube assembly on AR rifles. Made in the United States with mil-spec components and quality construction.LBE 4 Position Buffer Tube Kit4 Position Mil Spec Buffer Tube with matte finishCastle Nut and Standard End Plate includedCarbine Length Recoil SpringStandard Recoil BufferComplete kit - all components includedMade in USA with rigorous quality controlPerfect for AR rifle builds repairs or upgrades this complete kit ensures reliable operation and proper fit for your carbine-length gas system.