Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA replicas using:
- PolarStar F2 engine (dual-solenoid HPA engine with high pneumatic efficiency and programmable configuration).
- RETROARMS chamber (precision hop-up chamber with excellent bucking support and fine adjustment optimized for HPA).
This kit ensures perfect centering between the F2 nozzle and the RETROARMS chamber, eliminating lateral alignment issues that can cause feeding inconsistencies or double feeding. Fully compatible with ICS split systems and standard V2 gearboxes.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | PolarStar F2 M4 |
| Hop-up Chamber | RETROARMS |
| 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 (optional brass for maximum durability).
- Side clip for routing the F2 HPA tube/line.
- Front locking top cap specifically designed for the RETROARMS chamber.
- Rear plate with mounting point for an M5 screw (additional reinforcement).
Required components (not included)
- 4× M3 × 4.2 mm inserts
- 4× M3 × 8 SHCS screws
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