CNC hop-up chamber Maxx Model M4A PRO for AEG M4 / M16

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Maxx Model M4A PRO hop-up chamber ranks among the absolute top on the market and is designed for demanding players. The chamber is machined from a single piece of aircraft-grade aluminium using CNC, ensuring tight tolerances and perfect alignment with both the receiver and gearbox. The rotary dial allows fine hop-up adjustment, while the redesigned TDC pressure arm ensures even pressure on the bucking. The chamber is fully compatible with R-Hop and standard AEG hop-up buckings and supports nozzles in the range of 21.00 to 21.25 mm, with 21.20 mm working best in most builds (always depends on your setup). Thanks to the BB latching system, BBs stay inside the chamber after removing the magazine and can also be manually released. Precise alignment with the gearbox is ensured by a replaceable inlet adapter and brass guide wings, eliminating misalignment and improving barrel stability. As a great upgrade, we also recommend the EPeS tracer unit, which turns the transparent side covers into an illumination unit for tracer BBs.

Key features of the Maxx Model M4A PRO CNC hop-up chamber

CNC construction from 6061 aluminium

Machined from a single piece for maximum precision, strength and durability.

Rotary TDC hop-up adjustment

Smooth and precise tuning of pressure for consistent BB trajectory.

Compatible with R-Hop and standard buckings

Optimized for modern R-Hop and classic hop-up systems without performance loss.

BB latching system

Prevents BBs from falling out when removing the magazine and allows manual release.

Precise gearbox alignment

Replaceable inlet adapter and brass guide wings ensure perfect nozzle alignment.

Barrel stability

CNC Delrin C-Clip secures the inner barrel without vibration or movement.

Maxx Model M4A PRO CNC hop-up chamber

Precision CNC hop-up chamber for maximum accuracy and consistent AEG performance.

Technical specifications

• Compatibility: AEG M4 / M16 Tokyo Marui standard (except KWA)
• Material: 6061 aluminium
• Weight: 20 g
• Color: Red
• Length: 51.65 mm
• Height: 37.75 mm
• Gearbox fit diameter: 11 mm
• Outer barrel fit diameter: 12 mm
• Inner diameter: 8 mm
• Feeding tube diameter: min 8.85 mm
• Feeding tube length: max 6 mm
• Compatible nozzles: 21.00 to 21.25 mm

Package contents

• 1× CNC chamber with BB latching system
• 2× Transparent CNC vinyl cover
• 2× 2.5 mm CNC brass side wings
• 1× CNC steel pivot pin
• 1× CNC aluminium hop-up arm
• 1× CNC aluminium soft round nub
• 1× CNC aluminium soft flat nub 4 mm
• 1× CNC aluminium hard concave nub 4 mm
• 3× Steel nub springs
• 1× Steel spring guide
• 1× Steel upper tension spring
• 1× Steel central tension spring
• 1× CNC Delrin locking C-Clip
• 1× CNC brass barrel spacer
• 1× Brass O-ring spacer
• 1× CNC aluminium adjustment dial
• 1× Aluminium CNC inlet adapter 11 mm
• 1× CNC brass inlet spacer