Maxx Model Hop Up Chamber M4A- PRO Red gearbox The tension of the spring

The tension of the spring can be adjusted to further fine tune your results

BUILD COMES WITH 1 YEAR WARRANTY  Please do not change any programming settings asides from firing modes such as burst / binary / auto features

as you tighten the screw the brass piece will be pressed into its final position

Better vision = Better Experience

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Maxx Model Hop Up Chamber M4A- PRO Red gearbox The tension of the springThis is the newest offering from Maxx Model. The M4A Pro edition is designed for AEGs. 21mm 21. 25mm Nozzles are recommended for this unit. CNC Aluminum Hopup Chamber M4A Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on Tokyo Marui , including G&G, Kryatc, NOT 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