The Variant 1 is built on the precision matched 7075 billet receiver set. This matching lightweight receiver set makes the perfect foundation for this rifle. Keeping the shooter in mind, the lightweight design and tight tolerances appeal to the novice and expert alike. The Variant 1 is compatible with all mil-spec AR-15 style parts. The upper receiver has an optic-ready picatinny rail, while the lower receiver has an integrated and enlarged trigger guard and a flare cut magazine well.Precision CNC from aerospace aluminum billet 7075-T6Intricate lightweight designType III Hardcoat AnodizedM4 feed ramp extensionsForward assist (Removed from similar high end rifles)Edges deburred for clean smooth finishAllen screw bolt catch pinAllen screw forward assist pinWinter trigger guardDSI Billet Ambidextrous Charging HandleDSI Billet Ambidextrous 90 Degree Safety SelectorDSI M16 Bolt Carrier GroupDSI Ultralight Narrow Profile M-Lok 12'' ForearmDSI Steel Micro Gas BlockCarbine Gas SystemDSI 16'' 5.56 Threaded 1:9 Nitrite BarrelDSI Competition Compensator (Offered with a Pin and Weld upgrade)Magpul PMAG 10Magpul Fixed Carbine StockAmbidextrous Sling PlateHogue Pistol GripOptic Ready (sights not included)Trigger Lock