High-Performance CNC Aluminum Hopup Chamber for ICS M4i Pro

The CNC Aluminum Hopup Chamber M4i Pro is engineered to deliver unmatched accuracy and reliability for ICS CXP/CS4/EBB M4/M16 AEG users seeking a precision upgrade. Designed to eliminate inconsistencies in shot-to-shot performance, this advanced hopup system combines durable construction with intuitive adjustments to ensure every BB flies true. Its aluminum Rotary Dial Knob offers ultra-fine tuning for optimal hopup settings, while 4mm Bucking Nubs (with 6mm options) work seamlessly with R-Hop or standard hop systems to maintain consistent velocity and trajectory.

Compatibility is key: this chamber supports nozzle lengths from 21.00mm to 21.25mm and integrates effortlessly with most aftermarket buckings—preserving FPS without sacrificing stability. The included OD12mm Inlet Adaptor centers the unit perfectly in 12mm gearbox outlets (OD11mm and OD11.5mm adaptors available separately), eliminating wobble for rock-solid performance. CNC-machined brass side wings glide smoothly into outer barrel slots, while a reinforced Delrin Locking C-Clip secures the inner barrel tightly in place during high-speed firing.

A standout feature is its innovative BB Latching System—a game-changer for preventing mid-air pellet drops when removing magazines. The manual release arm lets you clear residual BBs effortlessly, ensuring hassle-free reloading in fast-paced scenarios. For nighttime use, pair it with the optional Dual UV LED Tracer Module (sold separately) to track shots in low-light conditions—ideal for tactical simulations or dusk matches.

Field tests confirm this upgrade can boost FPS by up to 30 over stock setups while maintaining reliability across extended sessions. Whether you’re upgrading legacy models or modern ICS builds, this chamber delivers precision engineering that outperforms generic alternatives—making it an essential upgrade for serious airsoft enthusiasts prioritizing accuracy and durability.