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Check the listing for details. MAXX CNC Aluminum Hopup Chamber M4P PRO for PolarStar HPA Engines. Condition: New. Listed at 84.00 USD. MAXX - CNC Aluminum Hopup Chamber M4P PRO for HPA PolarStar Engines on Standard M4 Platforms. Accepts the HPA PolarStar Engine M4 nozzle length. 1 x CNC Aluminum Hopup Chamber M4P Pro (with BB Latching System) unit.