Modifications Include but are not limited to: 1. Delayer Chip 2. High-Speed Gear Set (12:1 Ratio) 3. High-Speed Motor 4. Upgraded Bushings 5. Gearbox shimming (to reduce strain) 6. Upgraded Piston 30+ RPS with the appropriate battery. There’s several other minor modifications. Contact if you’d like more information. The box magazine is battery powered and hold up to 2500 rounds. The weapon was fielded once and was well maintained. It is in pristine condition. It is undamaged and comes with its original packaging (where packaging is applicable). Packaging is the same as what is found in a retail store.