Version 2.1 of the hop-up alignment system, designed for M4 / AR-15 AEG HPA replicas and ICS split platforms that use:
- Backdraft PHOENIX HPA Engine (high-performance modular HPA engine with more than 40 RPS and a wide pressure range).
- RetroArms CNC Hop-Up AR15 / M4 chamber (rotary hop-up chamber in 7075 CNC aluminum, designed for maximum precision and air seal).
RetroArms offers two versions of the hop-up; the difference lies in the lower part, which has a pin. If you need to remove it, please request the adapter.
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 exact centering between the PHOENIX nozzle and the RetroArms chamber, taking advantage of their tight tolerances to improve sealing, feeding consistency, and precision in demanding HPA builds.
Compatibility
| Element | Compatibility |
|---|---|
| HPA Engine | Backdraft PHOENIX M4 / V2 |
| Hop-up chamber | RetroArms CNC Hop-Up M4 / AR-15 |
| Base replica | M4 / AR-15 AEG, ICS M4 |
| Gearbox | Standard V2 / ICS V2 split |
| ICS metal lower | Fully compatible |
What the kit includes
- Rear clip for mounting using rear pin or fixed stock.
- Base with housing for M3 inserts (optional in brass for maximum rigidity).
- Side clip for guiding the PHOENIX HPA line.
- Upper front locking cap, adapted to the RetroArms CNC body and the threaded barrel / C‑clip system.
- Rear plate with fixing point for M5 screw that reinforces the assembly.
Required components (not included)
- 4× M3 × 4.2 mm inserts
- 4× M3 × 8 SHCS screws
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