Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA platforms with a V2 gearbox.
This kit is designed to combine the BlackDraft Phoenix 2026 engine with the PolarStar HopUp chamber. Its purpose is to maintain stable positioning between the nozzle and the chamber, reducing lateral play and helping achieve more consistent feeding.
The BlackDraft Phoenix is an HPA engine for V2 gearboxes featuring a modular FCU, trigger board, and adjustable configuration. The PolarStar HopUp chamber is designed for M4/M16 AEG and HPA platforms with standard V2 gearboxes, making this combination suitable for compact, stable, and easy-to-maintain M4 builds. [103][127]
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | BlackDraft Phoenix 2026 / V2 |
| Hop-up Chamber | PolarStar HopUp |
| Base Replica | M4 / AR15 AEG |
| Gearbox | Standard V2 |
| System | HPA |
This model is designed for standard V2 gearboxes. Always check nozzle positioning, inner barrel length, and chamber fit before final assembly.
What's Included in the Kit
- Alignment base for the BlackDraft Phoenix engine.
- Dedicated housing for the PolarStar HopUp chamber.
- Rear clip for mounting via the rear pin or fixed stock.
- Side clip for routing the HPA line.
- Upper front locking cap.
- Rear plate with a mounting point for an M5 screw.
- Mounting points for M3 inserts.
Required Components (Not Included)
- 4× M3 × 4.2 mm inserts
- 4× M3 × 8 SHCS screws
- 1× M5 screw
- 1× M5 washer
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