Pro-Win CNC Hop-up Chamber for AEG M4 / M16 – Blue

CNC Hop-Up Chamber for M4 / M16
The Pro-Win CNC hop-up chamber is a top-tier upgrade for airsoft M4 (AR-15) AEG rifles. It is made from aircraft-grade aluminum using precise CNC machining, eliminating weak points in the material that can occur in cheaper cast chambers. The chamber features a hard anodized finish in cobalt blue, enhancing its durability and giving it a unique appearance. Thanks to the adjustment ring, it offers stable hop-up tuning without unintended loosening. This chamber set a new standard for hop-up regulation in AEG M4/M16 rifles. The package includes a nylon pressure arm, the adjustment ring, a locking latch for the ring, an O-ring for smooth rotation, a barrel lock, and a lever pin. This system allows for quick hop-up rubber replacement and easy maintenance of the inner barrel. It is one of the most widely used and popular hop-up chambers, known for its high precision, durability, and stable performance, provided the hop-up rubber is properly sealed and the nozzle length is optimal (typically 21.3-21.5 mm).

Installation Tips

Before inserting the barrel with the hop-up rubber into the chamber, lightly lubricate the outer part of the rubber with silicone oil (avoid oil inside the rubber or on its lip).
The barrel should slide in with minimal resistance (without forceful pushing).
Secure the barrel in the chamber using the locking clip.
Install the pressure arm along with the pressure segment (not included) and secure it with the pin.
Ensure the hop-up rubber is properly aligned (the mound is centered).
Install the O-ring, then the adjustment ring, and secure it with the locking latch.
The rubber lip should not extend into the chamber feed area (this would restrict airflow).
The nozzle should press firmly against the rubber lip but not obstruct BB feeding.
To prevent chamber wobbling, use the included screw or purchase additional O-rings.

Key Features

High-precision CNC manufacturingEliminates material weak points, enhancing durability and consistency.
Anodized ..