Those looking towards upgrading their Version 2 gearbox with the much anticipated Systema Revolution Gearbox, you can now get them at RedWolf Airsoft. You can purchase a version for the M16A2 or for the M4A1. Just be prepared to shell out over US$400 which we hope would not be a big dent on your wallets... "The long awaited Revolution Gearbox by Systema is finally in stock, each set includes a Special MAGNUM Motor."

Systema M110 Revolution Gear Box for M16-A2

Systema M110 Revolution Gear Box for M4A1