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AIRSOFTCON 2026 - October 17, 2026

Maxx Model CNC Aluminum Hop-UpChamber for M4 Airsoft AEG Rifles
(Model: M4i PRO)

ID: 102035 (HU-MX-MX-HOP010MI)
MX-HOP010MI
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Hop-Upunit may require assembling
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Maxx Model Products

$79.00

Airsoft Authority Since 2001
Serving enthusiasts for over 25 years
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Buy with confidence - 90 day warranty
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The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.
Order within 6 hours 1 minutes Receive as soon as Sat Aug. 8

Product Description

Features

  • Hop-up for ICS AEGs with standard AEG inner barrels
  • Machined from a solid aircraft aluminum block with tight tolerances to provide better accuracy, consistency, and durability
  • Precision rotary dial design for fine hop-up adjustments
  • Re-engineered the hop-up levers and nubs to work best with R-hop, Flat-Hop and Standard-Hop to keep the BBs shooting straight and accurate on every single shot
  • Accepted the nozzle length from 21.00mm to 21.25mm
  • Fully compatible with most aftermarket soft and hard rubber bucking without losing FPS or dropping BBs
  • Equipped with a new CNC Delrin Locking C-Clip design to hold barrel tight without wobbling and twisting, 3 compression springs on top, at bottom and in center of housing to ensure the hop-up unit is exactly centered, straight and air tight
  • Compatible with any 12mm inner bore ICS AEG Gearbox/HPA Engine nozzle outlets
  • Specially designed with BB Latching System to prevent dropping BBs after removing the magazine, manually opened to release BBs from inside hop-up chamber by hand
CNC Aluminum Hop-UpChamber M4A Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on ICS/CS4/EBB M4/M16 AEG series rifles.

The Hop-UpChamber M4i unit is built with an aluminum rotary dial knob for fine hop-up adjustments, the precision hopup lever and 4mm bucking nubs to perform best with R-Hop and standard-hop to keep the BB shooting accurately and consistently on every single shot.The Hop-Up Chamber M4i unit is designed to accept 21.00mm to 21.25mm nozzle length, and fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BBs during use.

The Hop-Up Chamber M4i unit is wisely equipped with an interchangeable Inlet Adaptor OD12mm to ensure the hop-up unit is inserted exactly in the center of the 12mm inner bore ICS AEG outlet without wobbling. Also mounted the removable CNC brass side wings to slide smoothly into the outer barrel slots, and included an advanced CNC Delrin locking C-clip to hold the inner barrel tightly in place without wobbling and twisting.

Additionally, the Hop-Up Chamber M4i Pro unit is specially designed with a new BB Latching System to prevent BBs from dropping after removing the magazine. The Latching Arm can also be manually pressed to release the remaining BB from inside the hop-up chamber.

Manufacturer: Maxx Model

View official Evike.com article here!

Test Results: FPS might be increased from 10FPS to 30FPS over the stock setup. Please check your FPS!
Disclaimer: Professional installation highly recommended. Please use discretion when installing custom parts as fit and compatibility may vary. Modification may be required. Professional installation recommended.

Product Specifications

Hop-UpKit Includes:
  • 1 x CNC Aluminum Hop-UpChamber M4i Pro (with BB Latching System) unit
  • 2 x CNC Acrylic Side Cover
  • 2 x CNC Brass 2.9mm Side Wing
  • 1 x CNC Steel Pivot Pin
  • 1 x CNC Aluminum Hop-UpLever
  • 1 x CNC Aluminum Soft Round Nub
  • 1 x CNC Aluminum Soft Flat Nub (4mm)
  • 1 x CNC Aluminum Hard Concave Nub (4mm)
  • 3 x Steel Nub Spring
  • 1 x CNC Steel Spring Guide
  • 1 x Steel Upper Compression Spring
  • 1 x Steel Center Compression Spring
  • 1 x CNC Delrin Locking C-Clip
  • 1 x CNC Brass Barrel Spacer
  • 1 x Brass Barrel Spacer Holder Oring
  • 1 x CNC Aluminum Rotary Dial Knob
  • 1 x CNC Aluminum Inlet Adaptor (OD12mm)
  • 1 x CNC Brass Inlet Spacer

  • Overall Length: 51.65mm
    Overall Height: 37.75mm
    Inlet Adaptor Outer Diameter (to fit into Gear Box): 12mm
    Hub Outer Diameter (to fit into Outer Barrel): 12mm
    Hub Inner Diameter (to fit Nozzle): 8mm
    Feeder Outer Diameter (to fit magazine): 8.85mm
    Feeder Length (to fit magazine): 6mm
    Application: For most ICS CXP/CS4/EBB M4/M16 AEG series rifles
    Material: Aluminum 6061

    Product Videos (1)

    12 Customer Reviews (View All)

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    Maxx Model Products

    About Maxx Model Products

    Maxx Model Products, Inc. began in 2001 as a company known by Microheli.com based in Canada, we designed and manufactured high quality upgrade parts and accessories for RC Helicopters, Drones, and Cars. Starting in 2016, Maxx took its experience in high quality RC components and expanded to Airsoft. Maxx launched itself into the Airsoft market with the release of our original M4 PRO hop-up unit. Through feedback from the community and constant improvements, we have achieved the most advanced M4 hop-up unit with the ME model. Taking what we learned in that process, Maxx now brings our attention to other platforms. With our years of experience Maxx looks to manufacture more advanced and innovative products for the whole market. Maxx Model Products, Inc. is a registered business in Canada.