- -R925.00

Banner
No Events
Valid from 1 April - 30 April 2025
CNC Aluminum Hopup Chamber M4i Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on ICS CXP/CS4/EBB (include old models) M4/M16 AEG series.
The Hopup Chamber M4i unit is built with an aluminum Rotary Dial Knob for fine hopup adjustments, 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.
The Hopup Chamber M4i unit is designed to accept 21.00mm to 21.25mm nozzle length, and fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use.
The Hopup Chamber M4i unit is 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 optional)
Also mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots, and included an advanced CNC Delrin Locking C-Clip to hold the inner barrel tight in place without wobbling and twisting.
More than that, the Hopup Chamber M4i Pro unit is 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.
***The Dual UV LED Tracer Module is an add-on option to glow BB in the dark. Operating Voltage from 7VDC - 15VDC (2-4 cells LiPo, 6-13 cells NiCad). (Sold separately)
***Test results: FPS might be increased from 10FPS to 30FPS over the stock setup. Please check your FPS!
Includes | |
![]() |
1 x CNC Aluminum Hopup Chamber M4i Pro (with BB Latching System) unit |
![]() |
2 x CNC Acrylic Side Cover |
![]() |
2 x CNC Brass 2.9mm Side Wing |
![]() |
1 x CNC Steel Pivot Pin |
![]() |
1 x CNC Aluminum Hopup Lever |
![]() |
1 x CNC Aluminum Soft Round Nub |
![]() |
1 x CNC Aluminum Soft Flat Nub (4mm) |
![]() |
1 x CNC Aluminum Hard Concave Nub (4mm) |
![]() |
3 x Steel Nub Spring |
![]() |
1 x CNC Steel Spring Guide |
![]() |
1 x Steel Upper Compression Spring |
![]() |
1 x Steel Center Compression Spring |
![]() |
1 x CNC Delrin Locking C-Clip |
![]() |
1 x CNC Brass Barrel Spacer |
![]() |
1 x Brass Barrel Spacer Holder Oring |
![]() |
1 x CNC Aluminum Rotary Dial Knob |
![]() |
1 x CNC Aluminum Inlet Adaptor (OD12mm) |
![]() |
1 x CNC Brass Inlet Spacer |
Specification |
![]() |
Overall Length: 51.65mm |
![]() |
Overall Height: 38.75mm |
![]() |
Inlet Adaptor Outer Diameter (to fit into Gear Box): 12mm |
![]() |
Hub Outer Diameter (to fit into Outer Barrel): 12mm |
![]() |
Hub Inner Diameter (to fit Nozzle): 8mm |
![]() |
Feeder Outer Diameter (to fit magazine): 8.85mm |
![]() |
Feeder Length (to fit magazine): 6mm |
![]() |
Material: Aluminum 6061 |
Features | |
![]() |
Machined from a solid aircraft aluminum block with tight tolerances to achieve the most accuracy, consistency, and durability |
![]() |
Performed accurately and consistently on ICS CXP/CS4/EBB (include old models) M4/M16 AEG series |
![]() |
Precision Rotary Dial Knob for fine hopup adjustments |
![]() |
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 |
![]() |
Accepted 21.00mm to 21.25mm nozzle length |
![]() |
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! |
Weight | |
![]() |
N/A grams |
Usage | |
![]() |
Compatible with most ICS CXP/CS4/EBB (include old models) M4/M16 AEG series |
Requires | |
![]() |
Wearing eye protection is recommended |
![]() |
Use proper tools for disassembly and reassembly the gear box with great care due to spring tension |
![]() |
Bearing lubricant oil/grease is recommended for smooth operation |
Instruction | |
![]() |
Instruction Manuals are included |
Reference: RA-AT-E-ML-010-50
Brand: Maple Leaf
Maple Leaf SUPER Hop-Up Bucking for Airsoft AEG Rifles (Type: 50 Degrees)
Reference: AIR-BU-PROM-HARD
Brand: Prometheus
Prometheus Air Seal Chamber Packing / AEG Hop Up Bucking (Hard Type)
Reference: AIR-BG-PKM
Brand: Bullgear
Bullgear CNC Hop Up for LCT / A&K PKM Gen3
Reference: AIR-RA-AT-MAPLE LEAF 000
Brand: Maple Leaf
Maple Leaf Macaron AST Airsoft AEG Hopup Rubber Bucking - 50°
Reference: AIR-KTP-KA018-007P
Brand: Krytac
Krytac Hop-Up Bucking & Nub for Airsoft AEGs (Type: Soft)
Reference: AIR-G-20-001
Brand: GG
G&G Metal Hop-Up Chamber for UMG AEG - Metal Construction - Design for Replace the Original hop Up Chamber - For G&G UMG Series Airsoft Electric Gun AEG Rifle Gearbox
Reference: AIR-G-20-012
Brand: GG
G&G Hop-up Chamber for GK5C/GF76(Plastic) - Metal Construction - Design for Replace the Original hop Up Chamber - For G&G GK5C Series Airsoft Electric Gun AEG Rifle Gearbox
Reference: AIR-RA-MRHOP-50
Brand: Maple Leaf
Maple Leaf MR.HOP Hop-Up Bucking for R-HOP Airsoft AEG Barrels (Type: 50 Degrees)
Reference: AIR-RA-MRHOP-VSR50
Brand: Maple Leaf
Maple Leaf Mr. Hop Hop-Up Bucking for VSR-10 Airsoft Rifles & GBB Airsoft Pistols (Model: 50 / Green)
Reference: AIR-MX-HOP003CC
Brand: MAXX
MAXX Hopup Chamber Delrin C-Clip (for Maxx hopup series)
Reference: AIR-MX-HOP003RN
Brand: MAXX
MAXX Hopup Bucking R-Nub 6mm (for Maxx hopup series)
Reference: AIR-RA-AGENT-ML-029
Brand: Maple Leaf
Maple Leaf Autobot Hop-Up Bucking for WE-Tech/Tokyo Marui Gas Guns
Reference: AIR-EMG-Atlas-Blue
Brand: EMG
EMG Atlas Hop-Up Bucking for Airsoft AEG Rifles (Color: Blue)
Reference: AIR-G-20-008
Brand: GG
G&G Hop-Up Chamber for GK16/SCAR (Plastic) - Metal Construction - Design for Replace the Original hop Up Chamber - For G&G GK16 Series Airsoft Electric Gun AEG Rifle Gearbox