redline n7 milsim g1 maxx model alignment kit v2 1 m4

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

• REDLINE N7 MILSIM G1 engine (compact and modular HPA engine designed for milsim configurations with linear response and low air consumption).
• MAXX Model chamber (hop-up chamber optimized for HPA systems, with precise adjustment and compatibility with high-speed nozzles).

This system ensures perfect centering between the nozzle and the chamber, preventing feeding variations and improving the overall efficiency of the pneumatic system.
The kit replaces the original hop-up adjustment wheel with a thinner version that remains fully functional, optimized for the N7 + MAXX configuration.

Compatibility

Component	Compatibility
HPA Engine	REDLINE N7 MILSIM G1
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 direct stock attachment.
• Base compatible with M3 inserts (optional brass).
• Side clip for routing the HPA line.
• Front locking top cap.
• Rear plate with hole for an M5 screw (additional fixation).
• Slim hop-up adjustment wheel, fully functional for the MAXX chamber.

Installation and adjustment

1. Printing and preparation

   • Print with 65–80% infill.
   • Light sanding on contact areas for a better fit.
   • Apply wax or dry lubricant if frequent maintenance is expected.

2. Installation in the replica

   • Insert the base into the lower and install the M3 inserts.
   • Replace the original MAXX hop-up adjustment wheel with the included slimmer wheel (same functionality).
   • Install the MAXX chamber and inner barrel; the top cap locks the assembly in place from the front.

3. Final fixation

   • Secure the rear plate using an M5 screw and washer for maximum rigidity.
   • Verify that the REDLINE N7 G1 nozzle enters the chamber perfectly centered without lateral play.
   • Perform feeding tests and adjust the hop-up using the new adjustment wheel.

Required components (not included)

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

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Lower receiver recommendations

It is recommended to use the ICS metal lower receiver for maximum rigidity.
If you prefer to print your 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.