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. California compliant. (Not legal in NY) Precision CNC from aerospace aluminum billet 7075-T6 Intricate lightweight design Type 3 Hard Coat Anodizing Upper/lower tension screw setup M4 feed ramp extensions Forward assist (Removed from similar high end rifles) Edges deburred for clean smooth finish Allen screw bolt catch pin Allen screw forward assist pin Winter trigger guard DSI Billet Ambidextrous Charging Handle DSI Billet Ambidextrous 90 Degree Safety Selector DSI M16 Bolt Carrier Group DSI Ultralight Narrow Profile M-Lok 9'' Forearm DSI Steel Micro Gas Block Carbine Gas System DSI 16'' 5.56 Threaded 1:9 Nitrite Barrel DSI Competition Compensator Magpul PMAG 10 Magpul Fixed Carbine Stock Ambidextrous Sling Plate Strike Industries Featureless Fin Grip Optic Ready (sights not included) Trigger Lock