Version 2.1 of the hop-up alignment system, designed specifically for M4 AEG HPA replicas using:
- GATE Pulsar S engine (compact HPA engine with integrated electronic control and precise pressure adjustment).
- MAXX Model chamber (high-precision hop-up chamber optimized for HPA systems).
This system ensures solid and precise alignment between the Pulsar S nozzle and the MAXX Model chamber, guaranteeing maximum feeding consistency and optimal pressure efficiency in high-performance builds. Fully compatible with ICS SPLIT gearboxes and standard V2 platforms.
Compatibility
| Component | Compatibility |
|---|---|
| HPA Engine | GATE Pulsar S |
| Hop-up Chamber | MAXX Model |
| 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).
- Side clip for routing the HPA tube/line.
- Front locking top cap for the hop-up 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 and contact areas to ensure a clean fit.
- Apply dry lubricant or wax on sliding surfaces if frequent maintenance is expected.
2. Installation in the replica
- Insert the base into the lower and install the M3 inserts.
- Mount the rear clip aligned with the rear pin or the stock mounting point.
- Install the MAXX Model chamber and inner barrel; the top cap locks the assembly from the front.
- Route the Pulsar S HPA line through the side clip to prevent friction or sharp bends.
3. Final fixation
- Use an M5 screw with washer on the rear plate for maximum rigidity.
- Verify that the GATE Pulsar S nozzle enters the MAXX Model chamber perfectly centered with no lateral play.
Required components (not included)
-
4× M3 × 4.2 mm threaded inserts
-
4× M3 × 8 SHCS screws
Lower receiver recommendations
For maximum rigidity, it is recommended to use the ICS metal lower receiver.
If you prefer to print your own lower part, the following Gearbox V2 Lower “Universal Lower Part” models are compatible:
- Version 3
- Version 4.2
- Version 4.3 MTW
You can find them 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.
Recommended products
The most recent models added to the collection