Version 2.1 of the hop-up alignment system, designed for M4 / AR15 AEG HPA replicas with a V2 gearbox.
This kit is designed to combine the Redline N7 Gen 2 engine with a PolarStar HopUp chamber, maintaining stable positioning between the nozzle and the chamber entrance. The goal is to reduce lateral movement, improve feeding consistency, and make hop-up adjustments more repeatable.
The Redline N7 Gen 2 features a closed-bolt design with an extended nozzle. For this reason, proper alignment between the engine, chamber, and inner barrel is especially important for reliable feeding and a stable HPA setup.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | Redline N7 Gen 2 |
| Hop-up Chamber | PolarStar HopUp |
| Base Replica | M4 / AR15 AEG |
| Gearbox | V2 |
| Recommended Lower Receiver | Metal ICS / Compatible universal lower |
What's Included in the Kit
- Alignment base for the Redline N7 Gen 2 engine.
- Rear clip for mounting via the rear pin or fixed stock.
- Upper front locking cap for the PolarStar HopUp chamber.
- Side clip for routing the HPA line.
- 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 with washer for rear fastening
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