CNC hop-up chamber Maxx Model M4P PRO for HPA M4 / M16 (PolarStar)
Maxx Model M4P PRO hop-up chamber is among the absolute top on the market and is designed for demanding users. The chamber is machined from a single piece of aerospace-grade aluminum using CNC, ensuring precise tolerances and perfect alignment with the body and HPA system. The rotary adjustment wheel allows fine hop-up tuning, while the redesigned TDC pressure arm ensures even pressure on the bucking, the M4P version even includes 5 different aluminum nubs. The chamber is fully compatible with R-Hop and standard AEG hop-up buckings and is dimensionally optimized for use with all PolarStar HPA systems. Thanks to the BB latching system with lever, BBs do not fall out after removing the magazine and can be quickly released by pressing the lever. Precise nozzle alignment is ensured by a replaceable inlet adapter and brass guiding surfaces that eliminate misalignment and improve barrel stability. As a useful upgrade, we also recommend the EPeS illumination module, which transforms the side transparent covers into a tracer unit for TRACER BBs.
Key features of the Maxx Model M4P PRO CNC hop-up chamber
CNC aluminum 6061 construction
Machined from a single aluminum block for maximum precision, durability and long lifespan.
Rotary TDC hop-up adjustment
Smooth and precise tuning for consistent BB trajectory on every shot.
R-Hop and standard bucking compatibility
Optimized for modern R-HOP and classic hop-up systems without performance loss.
BB latching system with lever
Prevents BBs from falling out and allows quick release via lever.
Precise HPA nozzle alignment
Replaceable inlet adapter and brass guides ensure perfect centering.
Barrel stability
CNC Delrin C-Clip firmly secures the inner barrel without vibration or movement.
Maxx Model M4P PRO CNC hop-up chamber
Precision CNC hop-up chamber optimized for HPA systems and maximum consistency.
Technical specifications
- Compatibility: HPA M4 / M16 (PolarStar and compatible systems)
- Material: Aluminum 6061
- Weight: 20 g
- Color: Blue
- Length: 51,15 mm
- Height: 37,75 mm
- HPA inlet diameter: 11 mm
- Outer barrel diameter: 12 mm
- Inner diameter: 8 mm
- Feeding tube diameter: min 8,85 mm
- Feeding tube length: max 6 mm
- Compatibility: PolarStar HPA nozzles (F2™, Jack and others)
Package contents
- 1× CNC chamber with BB latching system and lever
- 2× Clear CNC vinyl cover
- 2× 2.5 mm CNC brass side plates
- 1× CNC steel pivot pin
- 1× CNC aluminum hop-up arm
- 1× Standard-Hop silicone nub
- 1× R-Hop silicone nub
- 1× CNC aluminum concave R-Hop nub 4.5 mm
- 1× CNC aluminum concave R-Hop nub 6 mm
- 1× CNC aluminum soft round nub
- 1× CNC aluminum soft flat nub 4 mm
- 1× CNC aluminum hard concave nub 4 mm
- 3× Steel Nub springs
- 1× Steel top tension spring
- 1× Steel barrel spring
- 1× Delrin Locking C-Clip CNC
- 1× Brass CNC centering ring
- 1× Rubber O-ring
- 1× CNC aluminum adjustment knob
- 1× Aluminum CNC inlet adapter 11 mm
Variants HPA Polarstar Color Blue Gearbox version V2 Hop-Up chamber material Metal
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