SPECIFICATIONS:

System : Electric
Action : Semi / Full
Gear Box : Version 2, B.R.S.S. HEAVY
Inner Barrel : 370mm 
Velocity : 400 fps
Length : 767 / 851 mm
Weight : 2850g
Hop up : Adjustable 
Battery : 11.1V Short Stick Lipo
Magazine : 300 rd Hicap

FEATURES: 

- FULL METAL construction meaning this airsoft gun has matching metal parts as its real counterpart
- Innovative B.R.S.S. HEAVY (Bolt Recoil Shock System, HEAVY version) generates realistic HEAVY recoil during each shot, while preserving the ability to take regular TM type M4/M16 magazines.  Recoil felt is stronger than that of the Tokyo Marui Next Gen M4 Sopmod) 
- Anodized aluminum upper and lower receiver and removable rear sight
- Blank Receiver without marking. Perfect for custom engraving!
- Full metal real specs R.I.S. unit 
- Nylon Fiber retractable special force crane stock and grip
- 14mm- threaded aluminum CNC outer barrel
- Metal one piece IMPROVED hop up unit and metal one piece outer barrel
- QD sling mount integrated in received end
- Precision inner barrel
- High Torque motor with heat dissipating end plate
- Metal furniture: Charging handle, magazine catch, bolt catch, selector, front sight, flash hider
- Other metal parts: Rear sight assembly, trigger, ejection port cover, trigger guard, magazine, front/rear sling mounts, forward assist knob, steel motor pinion gear, locking body pins, RIS unit
- Reinforced Vr 2 B.R.S.S. Gear Box with: M120 spring,  2020 Improved steel MIM gears, Steel Bushings, aluminum cylinder, aluminum cylinder head with double o-rings and impact pad, Aluminum piston with full steel teeth, aluminum one way piston head with bearings, heavy weight steel spring guide, POM nozzle 
- 11.1V Lipo  ready!

- Battery and charger NOT included

- Package includes: Airsoft gun, 300rd high capacity magazine, battery plug and wire extension (user manual available online at www.bolt.tw)

From the manufacturer: