Nine Ball High Bullet Valve for Tokyo Marui MP7A1 GBB SMG

Nine Ball High Bullet Valve for Tokyo Marui MP7A1 GBB SMG Extreme Output Power upgrade Increase the shooting power of each shot Withstand high pressure airsoft gas The ball bearings included with the Nine Ball Hi-Flow Valve are to be placed inside the gas reservoir to promote more consistent high-power gas release. As always, upgrading GBB require necessary skill & technique, consult expertise if needed