Manufacturer: Maxx Model
Inlet Adaptor Outer Diameter: 12mm (to fit into Gear Box)
Hub Outer Diameter: 12mm (to fit into Outer Barrel)
Hub Inner Diameter: 8mm (to fit Nozzle)
Feeder Outer Diameter: 8.85mm (to fit magazine)
Feeder Length: 6mm (to fit magazine)
Overall Length: 51.65mm
Overall Height: 38.75mm
Material: Aluminum 6061

Pros:

• Precisely-made form a block of aerospace aluminum using CNC technology
• Rotary adjustment knob
• Re-engineered the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot
• Removable Steel Pivot Pin for ease of setup and maintenance
• Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use
• Wisely equipped with an interchangeable Inlet Adaptor OD12mm to ensure the hopup unit is inserted exactly in the center of the 12mm inner bore ICS AEG Gearbox nozzle outlet without wobbling. (Inlet Adaptor OD11mm and OD11.5mm are sold separately)
• Mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots
• Included an advanced CNC Delrin Locking C-Clip to hold the inner barrel tight in place without wobbling and twisting
• Equipped with 2 compression springs on top and center to ensure the hopup unit is seated straight and air tight during use
• Specially designed with a new BB Latching System to prevent BB dropping after removing the magazine
• The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber
• Compatible with any 12mm inner bore ICS AEG Gearbox nozzle outlets
• The Dual UV LED Tracer Module to glow BB in the dark ready!

Cons:

• Compatible Gun: ICS CXP/CS4/EBB (include old models) M4/M16 AEG series
• Accepted 21.00mm to 21.25mm nozzle length

Comments: Increase your FPS by 5% to 10%! The Hopup Chamber M4i Pro is equipped with a new CNC Delrin Locking C-Clip design to hold barrel tight without wobbling and twisting, and come with 2 compression springs on top and at center of the housing respectively to ensure the hopup unit is exactly centered, straight and air tight at all times when adapted to any adapted to any V2 gear boxes with 12mm inner bore.