Blackdraft Phoenix 2026 + PROWIN · Alignment Kit V2.1 · M4 / AR15 AEG

Version 2.1 of the hop-up alignment system, designed for M4 / AR15 AEG replicas with a V2 gearbox.

This kit combines the Blackdraft Phoenix 2026 HPA engine with the PROWIN hop-up chamber to maintain stable alignment between the nozzle, bucking, and inner barrel. The result is more consistent feeding, improved air efficiency, and a reduced risk of misalignment during use.

The PROWIN M4 / AR15 hop-up chamber features a rigid, machined body that helps keep the hop-up assembly stable. The Blackdraft Phoenix V2 is a compact HPA engine with an FCU and trigger board for the M4 platform, designed for high-performance builds. [103][116]

Compatibility

Component	Compatibility
HPA Engine	Blackdraft Phoenix 2026 V2
Hop-up Chamber	PROWIN M4 / AR15 AEG
Base Replica	M4 / AR15 AEG
Gearbox	V2
Recommended Lower Receiver	Metal ICS or compatible universal lower

What's Included

• Rear clip for mounting using the rear pin or fixed stock attachment.
• Alignment base with mounting points for M3 inserts.
• Side clip for routing and organizing the HPA line.
• Upper front locking cap to keep the PROWIN chamber in position.
• Rear plate with a mounting point for an M5 screw.
• Support pieces to keep the engine, hop-up chamber, and inner barrel assembly centered.

Installation and Adjustment

1. Printing and Preparation

   • Print the parts with 65–80% infill.
   • PLA+ is recommended.
   • Lightly sand internal and contact surfaces until a clean fit is achieved.
   • Apply dry lubricant or wax to sliding surfaces if necessary.

2. Assembly

   • Install the M3 inserts into the base.
   • Install the Blackdraft Phoenix 2026 engine in the V2 gearbox.
   • Fit the PROWIN hop-up chamber alongside the inner barrel.
   • Install the rear clip using the replica's rear pin or stock mounting point.
   • Fit the upper cap to lock the chamber in place and limit vertical or lateral movement.
   • Route the HPA line through the side clip to prevent unnecessary friction, tension, or bending.

3. Final Securing and Checks

   • Secure the assembly using an M5 screw and washer on the rear plate.
   • Check that the nozzle enters the PROWIN chamber centrally without rubbing against its inner walls.
   • Perform dry feeding tests before using BBs.
   • Adjust the hop-up and FCU settings according to your setup, BB weight, and the field's power limits.

Important: Proper alignment does not replace the adjustment of the bucking, nozzle, inner barrel, magazines, or FCU parameters. Always verify that the entire system functions correctly before playing.

Required Components (Not Included)

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

Recommended Lower Receivers

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

If you prefer to 3D-print the lower receiver, the following Gearbox V2 Universal Lower models are compatible:

• Version 3
• Version 4.2
• Version 4.3 MTW

You can find them HERE.

3D Printing Parameters

• Approximate printing time: ~1 h 30 min
• Recommended material: PLA+
• Layer height: 0.10 mm – 0.15 mm
• Recommended infill: 65–80%
• Supports: Not required unless recommended by your slicer for the selected print orientation.

Manuals

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