Complete your tactical paintball vest

Standard Version 3 full metal gearbox with 9mm bearings and is fully upgradable with a plethora of aftermarket parts

All CNC machining tech makes gears work smoothly and durably with high torque springs

Easy to install that only takes seconds

MAXX M4A PRO Hopup Chamber FMA Complete your tactical paintball vestCNC Aluminum Hopup Chamber M4A Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on Tokyo Marui (include G&G, KRYTAC, except 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 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