The DPMS Oracle AR-15 Upper Receiver Assembly comes completely assembled and ready for installation on any standard small pin, mil-spec lower receiver. The Oracle is an excellent entry-level upper assembly that incorporates the versatility of the A3 Flat-Top configuration in selecting a preferred sighting arrangement with a solid, fully functional foundation of quality components. Add to that an attractive price and the Oracle becomes the ideal candidate for shooter customization and/or for assembling a lightweight, fast handling, general purpose carbine that won’t break the bank. The Oracle features a 16″ Light Contour “Pencil” Barrel for reduced weight, a true 5. Mfg: Dpms SPECS: Receiver – aluminum, anodized and Teflon coated, black. Oracle 16″ 4140 chrome-moly 1-9 barrel, 5.56x45mm chamber, A3 upper, A2 flash hider.Chrome-lined barrels are available only by special order.