gate pulsar h begadi neptune pro alignment kit v2 1 m4

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

• GATE Pulsar-H engine (high-performance HPA engine with integrated electronic control and compact design).
• Begadi Neptune Pro chamber (high-precision hop-up chamber optimized for HPA systems with micrometric adjustment).

This system ensures solid and precise alignment between the Pulsar-H nozzle and the Neptune Pro chamber, maximizing feeding consistency and allowing the HPA system pressure to be fully utilized for stable shot-to-shot performance.

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Compatibility

Component	Compatibility
HPA Engine	GATE Pulsar-H
Hop-up Chamber	Begadi Neptune Pro
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 Neptune Pro 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 and contact surfaces for a clean fit.
• Apply dry lubricant or wax on sliding areas to facilitate maintenance if desired.

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 the stock mounting point.
• Install the Begadi Neptune Pro chamber with the inner barrel; the top cap locks the assembly while keeping the barrel perfectly centered.
• Route the Pulsar-H HPA line through the side clip to avoid bends or friction.

3. Final fixation

• Secure the rear plate using an M5 screw with washer for maximum rigidity.
• Verify that the GATE Pulsar-H nozzle enters the Neptune Pro chamber perfectly centered without lateral play.
• Perform dry feeding tests and adjust the Neptune Pro 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 your own 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:
https://lab.sychev.xyz/prodcuts?q=universal

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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.