MAXX Model CNC Aluminum Hop-Up Chamber M4E for Standard M4 / M16 AEG Rifles

If you're chasing the highest level of consistency from your AEG, the MAXX Model M4E Hop-Up Chamber is one of the most respected upgrades available. Precision CNC machined from a solid block of aircraft-grade aluminum, the M4E is engineered to maximize air seal, improve BB consistency, and provide incredibly precise hop-up adjustment. Whether you're building a high-performance AEG or a tournament-ready HPA rifle, the M4E delivers the fit, finish, and reliability that serious builders demand.

The M4E features a numbered rotary adjustment dial for repeatable hop settings, an integrated BB latching system that prevents BBs from spilling when the magazine is removed, and dual compression springs that help maintain perfect alignment between the gearbox nozzle and hop-up chamber. MAXX also includes multiple hop-up nubs, shims, and barrel spacers, allowing users to fine-tune the chamber for standard buckings, flat-hop, and R-Hop configurations. A transparent inspection window makes it easy to verify BB feeding and nozzle alignment during installation and maintenance.

Designed specifically for Tokyo Marui-spec M4 and M16 AEG platforms, the M4E is compatible with most standard Version 2 M4 gearboxes, including many rifles from G&G, Krytac, Specna Arms, VFC, Classic Army, CYMA, and other TM-compatible manufacturers. Its interchangeable inlet adapter also makes it suitable for many HPA engine builds, making it one of the most versatile premium hop-up chambers available.

Features

• Precision CNC-machined 6061 aluminum construction
• Designed for Tokyo Marui-spec M4 / M16 AEG platforms
• Numbered rotary hop-up adjustment dial for precise tuning
• Integrated BB latching system prevents BBs from falling out during magazine changes
• Dual compression spring design improves chamber alignment and air seal
• Precision CNC hop arm for consistent pressure application
• Includes multiple hop-up nubs for standard, flat-hop, and R-Hop setups
• Transparent inspection window allows easy BB and nozzle alignment checks
• CNC Delrin locking C-clip securely centers the inner barrel
• Interchangeable inlet adapter supports both AEG and many HPA nozzle configurations
• Includes barrel spacers, shims, O-rings, and installation hardware
• Compatible with most Version 2 M4 AEG gearboxes

Specifications

Length: 51.65mm
Weight: 68g
Material: CNC-machined 6061 aluminum with brass, Delrin, and steel components
Compatibility: Tokyo Marui-spec M4 / M16 AEG rifles, including most G&G, Krytac, VFC, Specna Arms, Classic Army, CYMA, and compatible Version 2 platforms (not recommended for KWA AEGs)
Included Accessories: Rotary hop arm, multiple hop-up nubs, barrel spacers, Delrin locking C-clip, inlet adapter, O-rings, springs, and shim set
Manufacturer: MAXX Model