Features: Fiber reinforced polymer receiver w/ CNC machined metal outer barrel, flash hider, and barrel nut Newly designed gearbox w/ QD spring change capabilities Folding / removable stock Electronically controlled ECU gearbox for better battery and motor efficiency while offering crisp trigger response Functional bolt lock Empty magazine detection Ambidextrous controls 4 position fire selector w/ genuine 3-round burst capabilities Also Included: -Angel Customs 1500 Round Firestorm Airsoft AEG Drum Flashmag and Winding Drum Mag with interchangeable Scorpion Evo and M4 mag adapters. -350 Round Hi Capacity Scorpion Evo Hi Capacity Mag. -Matrix 1800mAh 15C 11.1 Lipo Battery Fully Charged. Does Not Include Smart Charger.