Premium .458 SOCOM Legend Complete Upper Build. Stop looking for an alternative. This .458 SOCOM upper offers unmatched control and recoil management utilizing our Gen2 .458 HADES Hybrid Muzzle Device.- Gen2 Stainless .458 HADES Hybrid Muzzle Device.-16" M4 Contour Barrel, made from 4150 Chromemoly Vanadium Steel. Chambered in .458 SOCOM Caliber, Carbine length gas system, 1:14 twist rate.Fully inspected barrel guarentee 1" MOA. Inspected with CMMs and Air Guages.- 7075T6 Billet Aluminum Side Charger Upper Reciever.-M16 Side Charger Bolt Carrier Group- 15" Billet Aluminum Keymod Handguard.- Milspec .936 Gas Block-Milspec Stainless Gas TubeEvery complete upper reciever sold is custom made and fine tuned to each caliber. Each upper is test fired prior to shipment.