Rifle kit comes with complete upper assembly head spaced and test fired, buttstock with components, and complete lower parts kit. Rifle Kit does NOT come with lower receiver or magazines.20" Pre-Ban Heavy Profile Rifle KitSTANDARD/RIFLE Gas SystemBarrel:Chrome Moly VanadiumM4 Feed Ramps20" Length1x9 TwistA2 Flash HiderManganese PhosphatedPhosphated under Front Sight BaseTaper Pins in F-marked Front Sight BaseThreaded MuzzleHeavy ProfileChamber:5.56 X 45 mmBolt And Carrier:Phosphated 8620 Steel Carrier AssemblyCarpenter 158 Bolt HPT/MPI TestedHeat Treated and PlatedMil-SpecChrome Lined Carrier InteriorCarrier Key - Chrome Lined, attached with Grade 8 ScrewsProperly Staked & Sealed Gas KeyHandguards:Standard (Rifle) LengthAluminum Delta RingSingle Heat ShieldUpper Receiver:Forged 7075 T6 AluminumA3 Flat Top with M4 Feed RampsHard Coat AnodizedMil-SpecEjection Port Cover and Round Forward AssistRight Hand EjectionBore's surface is coated with dry film lube, over the anodized surfaceButtstock:Standard A2 - Reinforced ZytelTrapdoor Assembly