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BlackDraft Phoenix 2026 + PolarStar HopUp · Alignment Kit V2.1 · M4 AEG HPA

23,00 €
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Version 2.1 of the hop-up alignment system, designed for M4 AEG HPA platforms with a V2 gearbox.

This kit is designed to combine the BlackDraft Phoenix 2026 engine with the PolarStar HopUp chamber. Its purpose is to maintain stable positioning between the nozzle and the chamber, reducing lateral play and helping achieve more consistent feeding.

The BlackDraft Phoenix is an HPA engine for V2 gearboxes featuring a modular FCU, trigger board, and adjustable configuration. The PolarStar HopUp chamber is designed for M4/M16 AEG and HPA platforms with standard V2 gearboxes, making this combination suitable for compact, stable, and easy-to-maintain M4 builds. [103][127]

Compatibility

Component Compatibility
HPA Engine BlackDraft Phoenix 2026 / V2
Hop-up Chamber PolarStar HopUp
Base Replica M4 / AR15 AEG
Gearbox Standard V2
System HPA

This model is designed for standard V2 gearboxes. Always check nozzle positioning, inner barrel length, and chamber fit before final assembly.

What's Included in the Kit

  • Alignment base for the BlackDraft Phoenix engine.
  • Dedicated housing for the PolarStar HopUp chamber.
  • Rear clip for mounting via the rear pin or fixed stock.
  • Side clip for routing the HPA line.
  • Upper front locking cap.
  • Rear plate with a mounting point for an M5 screw.
  • Mounting points for M3 inserts.

Installation and Adjustment

  1. Preparing the Parts

    Print the parts with 65%–80% infill. Lightly sand the internal and contact surfaces until a clean fit is achieved. If necessary, apply dry lubricant or wax to the mounting surfaces.

  2. Installing the Engine and Hop-up

    Install the BlackDraft Phoenix in the V2 gearbox, following the correct positioning of its trigger board and HPA line. Install the PolarStar HopUp chamber with the inner barrel and check that the nozzle enters the chamber straight.

  3. Securing the Kit

    Install the base and rear clip. Fit the upper cap to lock the chamber in position. Route the HPA line through the side clip and secure the rear plate with an M5 screw and washer to increase the assembly's rigidity.

  4. Final Checks

    Before closing the replica, move the chamber manually and check that there is no lateral pressure on the nozzle. Perform dry feeding tests and adjust the hop-up according to the BB weight being used.

Required Components (Not Included)

  • 4× M3 × 4.2 mm inserts
  • 4× M3 × 8 SHCS screws
  • 1× M5 screw
  • 1× M5 washer

Lower Receiver Recommendations

A metal ICS lower receiver is recommended for maximum rigidity in HPA configurations.

If you prefer to print your own lower receiver, the following Gearbox V2 Lower — Universal Lower models are compatible:

  • Version 3
  • Version 4.2
  • Version 4.3 MTW

You can find them HERE.

3D Printing Settings

  • Approximate Printing Time: ~1 hour 30 minutes
  • Recommended Material: PLA+
  • Layer Height: 0.10 mm–0.15 mm
  • Recommended Infill: 65%–80%
  • Supports: Not required unless necessary for the chosen print orientation

Manuals

Installation and adjustment manuals are available in the Manuals section of the website or on the project's Discord server.