Maxx Model CNC Aluminum Hop-Up Chamber M4i PRO for ICS Airsoft AEG Rifles

Upgrade your ICS AEG rifle to unmatched precision and consistency with the Maxx Model CNC Aluminum Hop-Up Chamber M4i PRO — a premium, high-performance hop-up unit engineered for players who demand professional-grade accuracy and reliability. Specifically designed for ICS CXP, CS4, and EBB M4/M16 AEG platforms, the M4i PRO delivers rock-solid alignment, exceptional air seal, and the kind of build quality only Maxx Model’s CNC machining can offer.

Precision CNC Machining for Superior Accuracy

Crafted from a solid block of aircraft-grade 6061 aluminum, the M4i PRO hop-up chamber provides unmatched durability, stability, and accuracy. Each unit is CNC-machined with tight tolerances to minimize air leakage and barrel movement — key factors that directly affect accuracy and FPS consistency. The result? Crisp, repeatable shots that perform at a competitive or professional level.

The rotary dial design offers precise and intuitive hop-up adjustment, giving players fine control over backspin for consistent flight paths. Whether you’re running standard-hop, flat-hop, or R-hop, this hop-up chamber ensures every BB leaves the barrel with consistent trajectory and range — perfect for both competitive gameplay and technical builds.

Optimized Compatibility for ICS Platforms

Unlike standard M4 hop-ups, the Maxx Model M4i PRO is built exclusively for ICS AEGs, including CXP, CS4, and EBB series. It is compatible with standard AEG inner barrels and accepts nozzle lengths between 21.00mm and 21.25mm.

To ensure flawless fitment, the M4i PRO features a 12mm OD aluminum inlet adaptor, precisely engineered to seat the hop-up perfectly inside the ICS gearbox or HPA engine outlet. This design guarantees proper alignment, eliminates wobble, and enhances air seal for consistent FPS output.

The chamber’s CNC brass side wings slide seamlessly into your outer barrel slots, keeping the unit centered and stable even during intense gameplay.

Enhanced Air Seal and Stability

Maxx Model’s attention to detail is evident in its innovative CNC Delrin Locking C-Clip system, which secures the inner barrel tightly without any twisting or wobble. Combined with three internal compression springs (top, bottom, and center), the hop-up chamber maintains perfect alignment inside your rifle — ensuring a completely airtight seal and maximum energy efficiency.

With improved air compression and reduced air loss, players can expect an FPS increase of 10–30 FPS compared to stock hop-up setups, depending on the rest of their build.

BB Latching System — Precision Meets Practicality

The M4i PRO includes Maxx’s signature BB Latching System, which prevents BBs from dropping out when removing the magazine — a common issue with standard hop-ups. This system conserves ammunition and maintains a clean reload experience during high-pressure matches.

Need to clear your chamber? Simply press the latch manually to release remaining BBs — a feature that adds both convenience and professionalism to your loadout.

Engineered for Tuning and Performance

The hop-up lever and included soft, flat, and concave aluminum nubs are optimized for R-Hop and Flat-Hop setups, offering unparalleled flexibility for different playstyles. Compatible with both soft and hard rubber buckings, the chamber allows players to experiment with hop-up pressure and consistency without FPS drops or feeding issues.

Whether you’re fine-tuning for CQB precision or long-range DMR consistency, the M4i PRO ensures elite-level performance and stability.

Specifications

• Material: CNC 6061 Aluminum

• Overall Length: 51.65mm

• Overall Height: 37.75mm

• Inlet Adaptor OD: 12mm

• Hub OD: 12mm

• Hub Inner Diameter: 8mm

• Feeder OD: 8.85mm

• Feeder Length: 6mm

• Compatibility: ICS CXP / CS4 / EBB M4 & M16 AEGs

• Nozzle Length: 21.00mm–21.25mm

• Expected FPS Gain: +10 to +30 FPS

• Material Grade: Aluminum 6061 CNC

Kit Includes: CNC aluminum M4i PRO chamber, side covers, brass side wings, steel pivot pin, aluminum lever, aluminum nubs, compression springs, locking C-clip, brass spacers, and rotary dial knob.

Why Choose the Maxx Model M4i PRO

• CNC-machined from solid aircraft-grade aluminum

• Rotary dial for precise hop-up adjustment

• Perfectly fits ICS AEGs (CXP, CS4, EBB)

• Tight barrel locking system for superior air seal

• BB latching system prevents ammo loss

• Optimized for R-Hop, Flat-Hop, and Standard-Hop setups

• Increases FPS and consistency across every shot

About Maxx Model Products

Founded in Canada in 2001 as MicroHeli, Maxx Model began designing precision CNC components for RC helicopters, drones, and cars. In 2016, they expanded into Airsoft, quickly earning a reputation for innovation and craftsmanship with the M4 PRO hop-up series. Today, Maxx Model continues to set the standard for precision-engineered Airsoft components, trusted by builders and pros worldwide.