polarstar f1 maxx model alignment kit v2 1 m4 aeg hpa

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

• PolarStar F1™ HPA Conversion Kit (universal drop-in engine for V2 gearboxes with programmable and highly efficient pneumatic control).
• MAXX Model chamber (high-precision CNC hop-up chamber optimized for HPA, offering excellent bucking support and consistent feeding).

This kit ensures perfect alignment between the F1 nozzle and the MAXX Model chamber, eliminating double-feeding issues and ensuring maximum consistency in high-performance HPA configurations. Compatible with ICS split systems and standard V2 gearboxes.

Compatibility

Component	Compatibility
HPA Engine	PolarStar F1 M4 HPA Conversion Kit
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 designed specifically for the MAXX Model 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 for a clean fit.
   • Apply dry lubricant or wax on sliding surfaces if desired.

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 MAXX Model chamber with the inner barrel; the top cap locks the assembly in place.
   • Route the F1 HPA line through the side clip to prevent bends.

3. Final fixation

   • Secure the rear plate using an M5 screw with washer for maximum rigidity.
   • Verify that the PolarStar F1 nozzle enters centered into the MAXX Model chamber.
   • Perform dry feeding tests before assembling the final lower receiver.

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 maximum rigidity.
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.