Version 2.1 of the hop-up alignment system, designed specifically for SCAR-L HPA replicas using:
- Wolverine Inferno 2 or Reaper 2 engines (compact HPA engines with excellent response and stable airflow).
- BEGADI Neptune PRO chamber (high-precision CNC hop-up chamber with micrometric adjustment and optimized support for R-Hop buckings).
This kit ensures perfect centering between the Wolverine nozzle and the Neptune PRO chamber, eliminating lateral variations and improving feeding consistency in high-performance SCAR-L builds. Fully compatible with ICS lowers and V2 / SCAR-adapted gearboxes.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | Wolverine Inferno 2 / Reaper 2 |
| Hop-up Chamber | BEGADI Neptune PRO |
| Base Replica | SCAR-L HPA |
| Gearbox | V2 / ICS SPLIT / SCAR-adapted |
What the kit includes
- Rear clip for mounting using the rear body pin or fixed stock.
- Base with housing for M3 threaded inserts (optional brass inserts for durability).
- Side clip for routing the Wolverine HPA line.
- Front locking top cap adapted for the Neptune PRO chamber.
- Rear plate with mounting point for an M5 screw (additional structural reinforcement).
Installation and adjustment
1. Printing and preparation
- Print the parts with 65–80% infill.
- Lightly sand internal areas and contact surfaces to ensure a precise fit.
- Apply dry lubricant or wax on sliding areas to simplify maintenance.
2. Installation in the replica
- Insert the base into the ICS lower receiver and install the M3 threaded inserts.
- Mount the rear clip aligned with the SCAR rear body pin.
- Install the Neptune PRO chamber with the inner barrel; the top cap locks the assembly and keeps everything centered.
- Route the Inferno 2 / Reaper 2 HPA line through the side clip to prevent friction.
3. Final fixation
- Secure the rear plate using an M5 screw with washer for maximum rigidity.
- Verify that the Wolverine nozzle enters the Neptune PRO chamber perfectly centered, without lateral play.
- Perform feeding tests and adjust engine pressure (60–120 PSI recommended for SCAR builds).
Required components (not included)
- 4× M3 × 4.2 mm threaded inserts
- 4× M3 × 8 SHCS screws
Lower receiver recommendations
Use the original ICS metal lower receiver for maximum rigidity in SCAR-L HPA platforms.
If you prefer a printable alternative, the following Gearbox V2 Lower “Universal Lower Part” models are compatible:
- Version 3
- Version 4.2
- Version 4.3 MTW
Available here:
https://lab.sychev.xyz/prodcuts?q=universal
3D printing parameters
- Approximate print time: ~1 h 30 min
- Recommended material: PLA+
- Layer height: 0.10 mm – 0.15 mm
Manuals
Installation and adjustment manuals are available in the Manuals section of the website or on the project’s Discord server.
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