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The CNC Aluminum Hopup Chamber M4P Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on many M4/M16 AEGs fitted with Polarstar engines.
The Hopup Chamber M4P 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 unit is designed to accept 21mm 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 M4P unit also features an interchangeable inlet adapter to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore HPA Engine nozzle outlet without wobble. Adjustable mounting lugs ensure this hop unit fits smoothly into the outer barrel slots and a CNC milled Delrin Locking clip holds the inner barrel tight in place without wobbling and twisting.
The M4P 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.
A Dual UV LED Tracer Module is an add-on option for tracer BBs - Sold separately.
Warning: Your FPS might be increased from 10FPS to 30FPS over the stock setup.