Maxx CNC Aluminium Hop Chamber - M4A ProMaxx CNC Aluminium Hop Chamber M4A Pro CNC Aluminum Hopup Chamber M4A Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently with most standard M4 M16 AEG series including; Tokyo Marui, G&G, KRYTAC, Evolution. The Hopup Chamber M4A unit is built with an aluminium 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
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