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).
- ALPHA chamber by Silent Industries (high-precision CNC hop-up chamber optimized for HPA with TDC adjustment and lip tensioner system).
This kit ensures a solid alignment between the Phoenix nozzle and the ALPHA chamber, optimized for the compact format of ICS MPX/CXP platforms. Fully compatible with the original ICS lower receiver and designed to fit within the limited internal space of SMG platforms.
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 | Silent Industries ALPHA |
| Base Replica | ICS MPX / CXP HPA |
| Gearbox | ICS (compatible with original ICS lower) |
What the kit includes
- Rear clip adapted for the compact ICS MPX/CXP format.
- Base with housing for M3 threaded inserts (optional brass).
- Side clip for routing the HPA tube/line.
- Front locking top cap specifically designed for the ALPHA chamber.
- Rear plate with mounting point for an M5 screw (additional reinforcement).
Installation and adjustment
1. Printing and preparation
- Print the parts with 65–80% infill.
- Lightly sand internal surfaces to ensure a perfect fit within the tight MPX/CXP receiver space.
- Apply dry lubricant on contact surfaces if frequent maintenance is expected.
2. Installation in the replica
- Insert the base into the original ICS lower receiver (or compatible printed lower).
- Mount the rear clip using the ICS MPX/CXP rear body pin.
- Install the ALPHA chamber with the inner barrel; the top cap locks the assembly and keeps everything centered.
- Route the Blackdraft Phoenix HPA line through the side clip designed for the compact MPX/CXP layout.
3. Final fixation
- Secure the rear plate using an M5 screw with washer for maximum rigidity.
- Verify that the Phoenix nozzle enters the ALPHA chamber perfectly centered without lateral play.
- Perform dry feeding tests, considering the limited internal space of the MPX/CXP platform.
Required components (not included)
- 4× M3 × 4.2 mm threaded inserts
- 4× M3 × 8 SHCS screws
Lower receiver recommendations
Fully compatible with the original ICS MPX/CXP lower receiver.
If you need printable alternatives for other projects, 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 format)
- 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