Features

• Machined from a solid aircraft aluminum block with tight tolerances to achieve the most accuracy, consistency, and durability
• Performed accurately and consistently with HPA PolarStar Engines on standard M4/M16 platform
• 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 the HPA PolarStar Engine M4 nozzle length
• Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use
• Equipped with an interchangeable Inlet Adaptor OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore 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 HPA Engine nozzle outlets
• The Dual UV LED Tracer Module to glow BB in the dark ready!

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 O-ring
• 1 x CNC Aluminum Rotary Dial Knob
• 1 x CNC Aluminum Inlet Adaptor (OD11mm)

Specifications

• Overall Length: 51.15mm
• Overall Height: 37.75mm
• Inlet Adaptor Outer Diameter (to fit into HPA Nozzle Outlet): 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
• Compatible with most HPA PolarStar Engines on standard M4/M16 platform