Professional upgrade set with the NBU air set. Include all parts for your succes upgrade. Dedicated for the M4 AEG. Recommended barrel 300-400 mm. Set include:
- Stainless steel cylinder - NBU
- Polycarbonate back pressure silent piston head with the bearing
- Stainless steel cylinder head with double O-rings
- Acetal nozzle with O-ring
- Light polycarbonate piston with the full metal teeth.
- M150 spring
- Stainless steel spring guide with the bearing.
- Hi torque gear set
- Shims and springs set
- Antireversal latch with the spring
- Tappet plate