blackdraft phoenix alpha silent industries alpha

Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA replicas using:

• Blackdraft Phoenix HPA Engine (budget high-performance HPA engine, 40+ RPS and wide pressure range).
• Silent Industries ALPHA M4/16 AEG/HPA Chamber (CNC hop-up chamber with TDC system and bucking lip tensioner optimized for HPA).

This system ensures solid and precise alignment between the Phoenix nozzle and the ALPHA chamber, preventing double feeds and improving the overall efficiency of the pneumatic system thanks to controlled pressure on the bucking and proper inner barrel guidance.

Compatibility

Component	Compatibility
HPA Engine	Blackdraft Phoenix M4 HPA Engine
Hop-up Chamber	Silent Industries ALPHA M4/16 AEG/HPA
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 (brass optional).
• Side clip for routing the HPA tube/line.
• Top cap for front locking of the ALPHA chamber.
• Rear plate with mounting point for M5 screw (additional reinforcement).

In this version the system is optimized to take advantage of the strong loading push typical of HPA engines and the bucking lip tension regulation of the ALPHA chamber, reducing double feeding issues and improving shot-to-shot consistency.

Installation and adjustment

1. Printing and preparation

   • Print the parts with 65–80% infill.
   • Lightly sand the internal areas and contact surfaces for a smooth fit.
   • If desired, apply dry lubricant or wax on sliding surfaces to facilitate maintenance.

2. Installation in the replica

   • Insert the base into the lower and install the M3 inserts.
   • Place the rear clip aligned with the rear pin or the stock mounting point.
   • Install the ALPHA chamber with the inner barrel; the top cap locks the assembly in the correct position and keeps the barrel centered.
   • Route the Phoenix HPA line through the side clip to prevent bending or friction.

3. Final fixing

   • Secure the rear plate with an M5 screw and washer to provide maximum rigidity to the assembly.
   • Check that the Blackdraft Phoenix nozzle enters the ALPHA chamber centered and that feeding is clean during dry testing.

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Required components (not included)

• 4× M3 inserts × 4.2 mm
  • Recommended links to brass M3 inserts.
• 4× M3 × 8 SHCS screws
  • Standard M3 socket head cap screws to secure the base.

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Recommended lower

Using the ICS metal lower is recommended for maximum rigidity.
If you prefer not to purchase it, there are several printable versions compatible with V2 gearboxes:

• Gearbox v2 Lower "Universal lower part" Version 3
• Gearbox v2 Lower "Universal lower part" Version 4.2
• Gearbox v2 Lower "Universal lower part" Version 4.3 MTW

You can find them HERE

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.