The popular airsoft gun JG M4 S-System now comes with special op package, featuring mock silencer (barrel extension), a red dot scope and elevated scope rings, and short polymer grip. Also comes with TAN color, for your own desert storm operation. All new latest production from JG factory with Newly enhanced design. Again the FPS has gone UP ! now is shooting 400 - 450 fps out of the box with 0.2g bb. This is one of the strongest stock gun available. Newest addition, all new upgraded JG M4 S-System, The latest UPGRADED version, code name:JG-F6613. JG factory newly designed upgraded version, now included higher torque motor, higher precision metal gear box, M120 spring, integrated barrel for increased shooting accuracy and initial starting speed. Factory pre-installed tight bore barrel enhances accuracy greatly and it out perform other peers on grouping. The new design performs excellent with high durability; putting this M4 to the next level of perfection in airsoft. First batch come in to US. JG M4-S-System is a Marui Clone A.E.G (Black) the finest made Electric Airsoft Guns by JG. This JG M4-S-System is an excellent clone of Tokyo Marui's JG M4-S-System. This AEG feels heavy on hand; most of the easy wear parts are made with metal. The front Rail RIS System handguard made with full metal. The upper and lower receiver are made in ABS. Both the front and rear sight are made in metal; very similar to Marui. When we check the gear box, its a nicely made metal gear box, with m120 spring. It shoots 400-450 fps with 0.2gbb, 500+ fps with 0.12g ! 

Package Includes:

• JG M4 S-System
• Red Dot and Elevated Scope Mount
• Stubby Vertical Fore Grip 
• Suppressor
• 300-Rounds Hi-Cap Magazine
• 8.4V Battery
• Charger
• Instruction Manual
• Cleaning Rod

JG F6613 Trouble Shooting:

When pull trigger, it makes gear grinding noise.
- Try to adjust motor height.
[ DIY Repair ]

When pull trigger, it makes high speed shifting nose, air nozzle not moving.
- piston broken
- air nozzle broken / dis-located
- tapper plate broken
[ Required Technician Repair ]

No power. Complete silence.
- fuse blown
- wires detached
- motor wires detached
- ground somewhere
[ Required Technician Repair ]

FPS extremely slow.
- Nozzle broken
- Piston broken
- hop up is worn / dislocated
- hop up seal is broken
- cylinder is leaking
[ Required Technician Repair ]

Eject door not closing
- door nip is broken
[ DIY repair ] [ Buy new parts ]