polarstar jack prowin alignment kit v2 1 m4 aeg hpa

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

• PolarStar JACK engine (compact HPA engine with a dual-solenoid system and integrated electronic control, ideal for builds with limited space).
• PROWIN chamber (high-precision hop-up chamber with excellent bucking support and a design optimized for HPA).

This kit ensures perfect centering between the JACK nozzle and the PROWIN chamber, eliminating lateral variations that affect feeding and consistency. Fully compatible with ICS split systems and standard V2 gearboxes.

Compatibility

Component	Compatibility
HPA Engine	PolarStar JACK
Hop-up Chamber	PROWIN
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 for increased durability).
• Side clip for routing the JACK HPA tube/line.
• Front locking top cap specifically designed for the PROWIN 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 areas and contact surfaces for a precise fit.
   • Apply dry lubricant or wax on moving areas if you want to make maintenance easier.

2. Installation in the replica

   • Insert the base into the lower and install the M3 inserts.
   • Install the rear clip aligned with the rear pin or the stock anchor point.
   • Install the PROWIN chamber with the inner barrel; the top cap locks the assembly while keeping the barrel perfectly centered.
   • Route the PolarStar JACK HPA line through the side clip for clean routing.

3. Final fixation

   • Secure the rear plate using an M5 screw and washer for maximum rigidity.
   • Verify that the JACK nozzle enters perfectly centered into the PROWIN chamber.
   • Perform dry feeding tests and adjust the JACK pressure (typical range: 45–120 PSI).

Required components (not included)

• 4× M3 × 4.2 mm inserts
• 4× M3 × 8 SHCS screws

Lower receiver recommendations

It is recommended to use the ICS metal lower receiver for high-performance builds.
If you prefer to print the 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.

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.