Version 2.1 of the hop-up alignment system, designed specifically for ICS MPX/CXP HPA replicas using:
- Blackdraft Phoenix engine (compact and affordable HPA engine with an excellent price-to-performance ratio).
- PROWIN chamber (high-precision hop-up chamber optimized for compact submachine gun platforms).
This kit ensures perfect alignment between the Phoenix nozzle and the PROWIN chamber, adapted to the compact geometry of ICS MPX/CXP platforms. Fully compatible with the original ICS lower receiver and ICS split gearbox systems.
This template was created for Phoenix Beta, which was released before 2026, so if you need the 2026 version, just let me know and I'll put it together for you.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | Blackdraft Phoenix |
| Hop-up Chamber | PROWIN |
| Base Replica | ICS MPX / CXP |
| Gearbox | ICS SPLIT (compatible ICS lower) |
What the kit includes
- Rear clip optimized for the ICS MPX/CXP rear body pin or fixed stock.
- Base with housing for M3 threaded inserts (optional brass for durability).
- Compact side clip for routing the HPA tube/line.
- Front locking top cap specifically designed for the PROWIN chamber.
- Rear plate with mounting point for an M5 screw (structural reinforcement).
Installation and adjustment
1. Printing and preparation
- Print the parts with 65–80% infill.
- Lightly sand internal areas to ensure a perfect fit within the compact MPX/CXP receiver.
- Apply dry lubricant on sliding surfaces to facilitate installation in tight geometries.
2. Installation in the replica
- Insert the base directly into the original ICS lower receiver (no modifications required).
- Mount the rear clip using the ICS OEM rear body pin.
- Install the PROWIN chamber with the inner barrel; the top cap locks the assembly while adapting to the compact MPX/CXP geometry.
- Route the Blackdraft Phoenix HPA line through the side clip designed for the limited internal space.
3. Final fixation
- Secure the rear plate using an M5 screw with washer for maximum stability.
- Verify that the Phoenix nozzle enters the PROWIN chamber perfectly centered without lateral play.
- Perform feeding tests considering the compact internal layout of ICS MPX/CXP platforms.
Required components (not included)
- 4× M3 × 4.2 mm threaded inserts
- 4× M3 × 8 SHCS screws
Lower receiver recommendations
This kit is 100% compatible with the original ICS MPX/CXP lower receiver.
If you need printable alternatives for Gearbox V2 builds, the following Gearbox V2 Lower “Universal Lower Part” models also work:
- 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 15 min (compact geometry)
- 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.
Recommended products
The most recent models added to the collection