CNC Aluminum Hopup Chamber M4i -PRO - ICS

The Maxx Model CNC Aluminum Hop-up Chamber M4i Pro is a premium upgrade for ICS M4/M16 AEG users (compatible with CXP, CS4, and EBB models – including older generations) who want more than just a basic hop-up system.

Crafted from CNC-machined 6061 aluminum, the M4i Pro offers outstanding durability and precision fitting. That means no wobble, no air leaks, and reliable performance with every shot.

One of the standout features is the rotary adjustment dial, allowing for fine-tuning your hop-up pressure even during a game. Inside the box, you’ll find various pressure nubs (round, flat, soft, and hard), so whether you run a standard hop or an R-Hop setup, you’ll have everything you need to dial it in.

Another key innovation is the BB Latching System, which prevents BBs from falling out when you remove your magazine. It also includes a manual release lever to easily empty the chamber when needed.

What else sets it apart?

• Brass side wings keep the chamber aligned perfectly in the outer barrel

• A CNC Delrin C-Clip locks your inner barrel in place with zero movement

• Dual spring system ensures the chamber aligns properly with the gearbox nozzle

• Compatible with 21.00mm–21.25mm nozzles

• Works with most aftermarket hop-up buckings (both soft and hard)

Thanks to the tight seal and optimized geometry, many users report an FPS increase of 10–30 FPS over standard hop-up units – but the real advantage is the improved consistency, stable flight path, and better hop-up control.

It also supports an optional Dual UV LED Tracer Module (sold separately), perfect for night games and indoor CQB.

 Key Benefits:

• BB retention system prevents wasted shots

• Easy and secure rotary hop-up adjustment

• Fully R-Hop compatible

• Supports minor FPS boost with better sealing

• Drop-in upgrade for most ICS M4/M16 AEGs