Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA replicas using:
- PolarStar F2™ HPA Conversion Kit (dual-solenoid HPA engine, highly efficient and fully adjustable in pressure and air volume).
- Silent Industries ALPHA M4/16 AEG/HPA Chamber (CNC hop-up chamber with TRUE-TDC system, bucking lip tension ring, and barrel alignment groove, designed specifically for demanding HPA builds).
This kit ensures precise alignment between the F2 nozzle and the ALPHA chamber, allowing full advantage of the F2’s preloaded spring nozzle and the ALPHA’s bucking lip tension system to prevent double feeding and improve shot-to-shot consistency.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | PolarStar F2 M4 / V2 HPA Conversion Kit |
| 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, designed to respect its CNC geometry and barrel support.
- Rear plate with mounting point for an M5 screw that reinforces the assembly.
Required components (not included)
- 4× M3 inserts × 4.2 mm
- 4× M3 × 8 SHCS screws
(Standard hardware links used in the other kits can be reused here.)
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