polarstar f2 gate eon 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 F2 engine (dual-solenoid HPA engine with high efficiency and fully adjustable pneumatic control).
• GATE EON chamber (compact CNC hop-up chamber with micrometric adjustment system and design optimized for HPA builds).

This kit ensures precise alignment between the F2 nozzle and the GATE EON chamber, guaranteeing consistent feeding while taking advantage of the compact design of both components. Compatible with standard V2 gearboxes and ICS SPLIT platforms.

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Compatibility

Component	Compatibility
HPA Engine	PolarStar F2 M4 HPA
Hop-up Chamber	GATE EON
Base Replica	M4 AEG
Gearbox	V2 / ICS SPLIT

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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 GATE EON chamber.
• Rear plate with mounting point for an M5 screw (additional reinforcement).

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Installation and adjustment

1. Printing and preparation

• Print the parts with 65–80% infill.
• Lightly sand internal areas to achieve a clean fit.
• Apply dry lubricant or wax if you want to simplify maintenance.

2. Installation in the replica

• Insert the base into the lower and install the M3 inserts.
• Mount the rear clip aligned with the rear pin or stock mounting point.
• Install the GATE EON chamber with the inner barrel; the top cap locks the assembly in position.
• Route the F2 HPA line through the side clip.

3. Final fixation

• Secure the rear plate using an M5 screw with washer for maximum rigidity.
• Verify that the PolarStar F2 nozzle enters the GATE EON chamber perfectly centered.
• Adjust the EON micrometric hop-up according to your BB weight and bucking.

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Required components (not included)

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

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Lower receiver recommendations

For maximum rigidity it is recommended to use the ICS metal lower receiver.

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.

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3D printing parameters

• Approximate print time: ~1 h 30 min
• Recommended material: PLA+
• Layer height: 0.10 mm – 0.15 mm

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Manuals

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