Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA replicas with V2 or ICS split gearboxes using:
- PolarStar JACK Engine (single-solenoid HPA engine, simple, efficient, and widely used).
- Silent Industries ALPHA M4/16 AEG/HPA Chamber (CNC hop-up chamber with TRUE-TDC and precise bucking control).
This version of ALPHA is from before 2026; the body is rounded.
This kit ensures solid and precise alignment between the JACK nozzle and the ALPHA chamber, preventing misalignment, double feeds, and shot inconsistency—something critical in high-ROF HPA builds.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | PolarStar JACK |
| 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 line.
- Top cap for front locking of the ALPHA chamber.
- Rear plate with mounting point for an M5 screw, providing extra rigidity to the assembly.
Required components (not included)
- 4× M3 inserts × 4.2 mm
- 4× M3 × 8 SHCS screws
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