Gear box internals
- Aluminum CNC O-Ring Nozzle For M4/M16
- Upgrade Spring Guide Ver.2 Gearbox
- Upgrade Aluminum Piston Head and Bearing
- Upgrade Nylon Piston Head and Bearing
- Upgrade Stainless Cylinder 451-550mm Barrel
- Upgrade Stainless Cylinder 401-450mm Barrel
- Upgrade Stainless Cylinder 301-400mm Barrel
- Steel Gear Set Genuine Torque
- Upgrade Steel Gear Set Super High Speed
- Upgrade Steel Gear Set Original Ratio
- Upgrade Steel Gear Set Super High Torque
- Upgrade Shim Set
- Steel Pinion Gear(D Shape)
- Steel Pinion Gear(O Shape)
- Upgrade Radial Ball Bearings 7mm
- Upgrade Radial Ball Bearings 8m
- Upgrade Self Lubricating Bushings 6mm
- Upgrade Self Lubricating Bushings 7mm
- Upgrade Self Lubricating Bushings 8mm
- Upgrade 8mm Bearing Ver.2 Gearbox
- Upgrade Motor Cage Ver.3 Gearbox
- Upgrade Safety & Selector Levers SetFor AK
- Upgrade Silver Plated Wiring For M4
- Upgrade Nylon Piston - High Speed
- Upgrade Polycarbonate Piston
- Upgrade 3 Steel Teeth Nylon Piston
- Upgrade 7 Steel Teeth Nylon Piston
- Upgrade Full Steel Teeth Nylon Piston
- Upgrade High Speed Full Steel Teeth Nylon Piston
- Upgrade Nylon Tappet Plate For G36
- Upgrade Nylon Tappet Plate For M4/M16
- Upgrade Nylon Tappet Plate For AK
- Upgrade Nylon Selector Plate For MP5
- Upgrade Nylon Selector Plate For M4/M16
- Upgrade Nylon Selector Plate For AK
- Upgrade Nylon Selector Plate For G36
- Upgrade High Torque Motor
- Upgrade Hop-Up Bucking (50D)
- Upgrade Hop-Up Bucking (70D)
- Power Spring E90 Performance Center
- Power Spring E100 Performance Center
- Power Spring E120 Performance Center
- Power Spring E130 Performance Center
- Gear Box Spring Set Performance Center
- Silent Piston Head And CNC Ver.2 Cylinder Head
- Upgrade Spring Guide Ver 3 Gearbox
- Upgrade Trigger For M4/M16