Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA replicas using:
- Blackdraft Phoenix HPA Engine (budget high-performance HPA engine, 40+ RPS and wide pressure range).
- Silent Industries ALPHA M4/16 AEG/HPA Chamber (CNC hop-up chamber with TDC system and bucking lip tensioner optimized for HPA).
This version of ALPHA is from before 2026; the body is rounded.
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 system ensures solid and precise alignment between the Phoenix nozzle and the ALPHA chamber, preventing double feeds and improving the overall efficiency of the pneumatic system thanks to controlled pressure on the bucking and proper inner barrel guidance.
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 | Silent Industries ALPHA M4/16 AEG/HPA |
| 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 (brass optional).
- Side clip for routing the HPA tube/line.
- Top cap for front locking of the ALPHA chamber.
- Rear plate with mounting point for M5 screw (additional reinforcement).
In this version the system is optimized to take advantage of the strong loading push typical of HPA engines and the bucking lip tension regulation of the ALPHA chamber, reducing double feeding issues and improving shot-to-shot consistency.
Required components (not included)
- 4× M3 inserts × 4.2 mm
- Recommended links to brass M3 inserts.
- 4× M3 × 8 SHCS screws
- Standard M3 socket head cap screws to secure the base.
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