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CNC Aluminum Hopup Chamber M4A - PRO

The highest quality Hop-Up chamber designed for tuning M4 / M16 replicas. Rotary chambers manufactured by Maxx Model Products are made for the most demanding of players, they offer precise workmanship that is unprecedented on the market and perfect operation of the HU system in the replica.


- precisely made of a block of aviation aluminum using CNC technology
- compatible with M4 / M16 carbine replicas in the Tokyo Marui standard (including G&G or Krytac replicas, but NOT KWA)
- rotary knob for adjustment
- redesigned precise HopUp and 4mm Bucking Nubs levers (6mm versions are optional), ensuring trouble-free operation with standard and R-hop elastics
- Removable steel Pivot Pin for setup and maintenance
- works with nozzles with a length of 21.00mm to 21.25mm
- full compatibility with most soft and hard HU elastics available on the market, with zero FPS drops and balls falling out
- equipped with a special CNC Delrin Locking C-Clip, preventing vibration and barrel movement
- equipped with 2 compression springs at the top and in the middle of the chamber, ensuring a perfect and secure fit in the replica
- equipped with an 11mm Inlet Adapter for the gearbox (11.5 and 12mm versions available separately) to ensure the central arrangement of the nozzle in the chamber and reduce wobble
- added, replaceable brass side wings to improve the fit of the chamber in the outer barrel
- redesigned "BB Latching System", preventing the BBs from falling out after removing the magazine from the replica
- The remie holding the BB’s can be pressed by hand to release the BB’s from the chamber
- possibility of mounting a BB tracer unit (not included)

Length: 51.65mm
Height: 37.75mm
Hub Outer Diameter (for the gearbox): 11mm
Hub Outer Diameter (for the outer barrel): 12mm
Hub Inner Diameter (to the nozzle): 8mm
Feeder Outer Diameter (for magazine): min 8.85mm
Feeder Length (for magazine): max 6mm
Execution: Aluminium 6061

The set includes:

1 x CNC chamber with BB Latching system
2 x clear CNC vinyl cover
2 x 2.5mm CNC Brass Side Wing
1 x Steel CNC Pivot Pin
1 x HopUp CNC aluminum arm
1 x Aluminum Soft Round Nub CNC
1 x Aluminum Soft Flat Nub CNC (4mm)
1 x Aluminum Hard Concave Nub CNC (4mm)
3 x steel Nub Spring
1 x steel CNC spring guide
1 x steel top compression spring
1 x steel central compression spring
1 x Delrin Locking C-Clip CNC
1 x Brass CNC Barrel Spacer
1 x Brass Spacer Holder Oring
1 x CNC aluminum adjustment knob
1 x Aluminum Inlet CNC Adapter (11mm)
1 x Brass Inlet Spacer CNC