Version 2.1 of the hop-up alignment system, designed specifically for M4 AEG HPA replicas using:
- PolarStar F2 engine (dual-solenoid HPA engine with precise control of pressure and air volume).
- Begadi Neptune PRO chamber (high-precision hop-up chamber optimized for HPA with fine bucking adjustment).
This kit ensures perfect alignment between the F2 nozzle and the Neptune PRO chamber, eliminating lateral misalignment issues and improving feeding consistency in high-rate-of-fire builds. It is fully compatible with ICS split gearbox systems.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | PolarStar F2 M4 / V2 |
| Hop-up Chamber | Begadi Neptune PRO |
| Base Replica | M4 AEG |
| Gearbox | V2 / ICS SPLIT |
What the kit includes
- Rear clip for mounting via rear pin or fixed stock.
- Base with housing for M3 inserts (optional brass).
- Side clip for routing the PolarStar F2 HPA line.
- Front locking top cap designed specifically for Neptune PRO.
- Rear plate with mounting point for an M5 screw (additional reinforcement).
Required components (not included)
- 4× M3 × 4.2 mm threaded inserts
- 4× M3 × 8 SHCS screws
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