CNC Aluminum Hopup Chamber M4A Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on Tokyo Marui (include G&G, KRYTAC, except KWA) Standard M4/M16 AEG series.

The Hopup Chamber M4A 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 M4A 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 M4A unit is wisely equipped with an interchangeable Inlet Adaptor OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore AEG Gearbox/HPA Engine nozzle outlet without wobbling. (Inlet Adaptor OD11.5mm and OD12mm 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 M4A 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 M4A Pro (with BB Latching System) unit
	2 x CNC Acrylic Side Cover
	2 x CNC Brass 2.5mm 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 (OD11mm)
	1 x CNC Brass Inlet Spacer

	Overall Length: 51.65mm
	Overall Height: 37.75mm
	Inlet Adaptor Outer Diameter (to fit into Gear Box): 11mm
	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 Tokyo Marui (include G&G, KRYTAC, except KWA) Standard 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 OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore AEG Gearbox/HPA Engine nozzle outlet without wobbling. (Inlet Adaptor OD11.5mm and OD12mm 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 11mm inner bore AEG Gearbox/HPA Engine nozzle outlets
	The Dual UV LED Tracer Module to glow BB in the dark ready!