The Top Japan Shell Ejecting M4 Blowback AEG gets another variant and it's the SOPMOD version which you can get from eHobby Asia for US$610.00... "Top (Japan) New Design Shell Ejecting Blowback System can make you enjoy the most realistic shell loading, firing, shell ejecting and Blow Back like a real steel, thus, operated by electric power. Rate of firing can be up to 11rounds per second!

TOP (Japan) M4A1 SOPMOD Ultimate Shell Ejecting Blowback AEG

• Semi & Fully Automatic Shooting mode
• Airsoft Electric Blow Black System
• Realistic Shell Ejecting Mechanism
• Full Metal Bolt Base + Lightweight plastic chamber
• Full Metal Receiver & Barrel Construction
• 360mm Outer Barrel with 45mm Flash hider
• 185mm RAS Rail System Handguard
• 6 position Extendable Stock
• Adjustable Rear Sight
• Magazine accommodate 30 Cartridge Shells each holding 1 Rounds of 6mm Plastic Pellet
• Realistic Blot stop system, stopped after shot the final bullet
• Stock pipe take up to 11.1V 1200mAh Li-Po Rechargeable Battery (Mini T-Plug)
• Sling mount can be installed with any single, 2- or 3- point tactical sling
• Come with 1040mm x 350mm Rifle Carry Bag"