Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA replicas using:
- Blackdraft Phoenix engine (compact and affordable HPA engine with an excellent price-to-performance ratio).
- Begadi Neptune Pro chamber (high-precision hop-up chamber with micrometric adjustment and geometry optimized for HPA systems).
BlackDraft Phoenix: This version is a pre-2026 beta release that is not compatible with 2026. If you need it, you can request it.
This kit ensures solid and precise alignment between the Phoenix nozzle and the Neptune Pro chamber, maximizing feeding consistency and taking full advantage of the direct airflow from the HPA engine for improved compression and long-range shot grouping.
This template was created for Phoenix Beta, which was released before 2026, so if you need the 2026 version, just let me know and I'll put it together for you.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | Blackdraft Phoenix M4 HPA Engine |
| Hop-up Chamber | Begadi Neptune Pro |
| Base Replica | M4 AEG |
| Gearbox | V2 / ICS SPLIT (explicitly ICS compatible) |
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 HPA tube/line.
- Front locking top cap designed specifically for the Neptune Pro geometry.
- 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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