EMG / Maxx Model CNC Aluminum Hopup Chamber M4E Pro with BB Latching System – Unmatched Precision for M4/M16 AEG Rifles

Elevate your airsoft performance to the next level with the EMG / Maxx Model CNC Aluminum Hopup Chamber M4E Pro, engineered for elite shooters demanding tight groupings, consistent performance, and total reliability. This hop-up unit is precision CNC-machined from a solid block of aircraft-grade 6061 aluminum, offering tight tolerances that ensure every shot is as accurate as your last.

Whether you're running Tokyo Marui spec M4/M16 AEGs, G&G, KRYTAC, or other compatible platforms (excluding KWA), this hop-up unit is designed for full compatibility and optimized performance.

Why Choose the M4E Pro Hopup Chamber?

1. Ultra-Consistent BB Seating & Feeding
With a 95%+ straight and consistent BB stacking rate, this chamber drastically reduces jamming, double-feeds, or misfires. Internal alignment has been reworked to ensure seamless feeding, even under high-speed and high-stress use.

2. Versatile Hop-up Support
Precision rotary dial design allows for fine-tuned hopup adjustments, while re-engineered hopup levers and included nubs are optimized for R-Hop, Flat-Hop, and Standard-Hop setups. No matter your build, this unit keeps your BBs flying straight.

3. Complete Air Seal & Stability
Three integrated compression springs (top, bottom, and center) keep the unit perfectly centered and air-tight within your outer barrel and gearbox, eliminating wobble or power loss. The CNC Delrin locking C-clip holds your inner barrel firmly, enhancing consistency shot after shot.

4. Enhanced Durability with CNC Craftsmanship
Constructed entirely from premium 6061 aluminum, the M4E Pro is built to withstand the rigors of high-performance airsoft. Every component—from the rotary dial to the locking C-clip—is CNC-machined for precision and durability.

5. BB Latching System
Tired of losing BBs when removing your mag? The built-in BB Latching System prevents BBs from falling out of the chamber. Manually release them when needed with the simple press of a latch.

6. Drop-in Ready for V2 Gearboxes
Compatible with 11mm or 11.5mm bore gearboxes, this hop-up accepts nozzles ranging from 21.00mm to 21.25mm, and works with both soft and hard buckings without sacrificing FPS or feeding reliability.

Full Kit Included

The M4E Pro kit includes everything you need for a full hop-up upgrade: aluminum hopup lever, multiple concave and flat nubs, steel compression springs, brass spacers, locking components, and an Inlet Adaptor (OD11mm) to ensure perfect fitment in your AEG gearbox or HPA setup.

Installation Note:

Ensure compatibility with your inner barrel and nozzle. Test FPS after installation—an increase of 5–10% is typical due to improved air seal and alignment.

Specifications:

• Material: CNC 6061 Aluminum

• Overall Length: 51.65mm

• Overall Height: 37.75mm

• Nozzle Compatibility: 21.00mm – 21.25mm

• Feeder Diameter: 8.85mm

• Bore Compatibility: 11mm & 11.5mm (AEG Gearbox or HPA)

• Compatible Brands: Tokyo Marui, G&G, Krytac, Madbull, Maple Leaf, Begadi, VFC, and more

• Hopup Adjustment: Rotary Dial

• BB Retention: Manual-release BB Latching System

About the Brands

EMG (Evike Manufacturing Group)
Dedicated to innovation and performance, EMG partners with top-tier airsoft designers to produce elite-grade replicas and upgrade parts tailored to the demands of advanced players.

Maxx Model Products
Originally a premier RC component manufacturer, Maxx brought its CNC precision to the airsoft world in 2016. Known for high-performance hop-up chambers, Maxx Model continues to push the boundaries of what’s possible in airsoft upgrades.

Whether you're building a DMR, speedsoft rifle, or a precision CQB platform, the EMG / Maxx Model M4E Pro CNC Hopup Chamber delivers the consistency and reliability needed for competitive performance. Upgrade once—outperform forever.