If you want your gun louder, 1) short barrel. Under 300mm. 2) Metal piston head with a thin rubber cylinder head. If you want to get fancy, glue a metal washer to the cylinder head to a nice metal to metal ring. 3) Madbull KX3 Flash hider with all the ports opened. With some of these mods, don't expect your gearbox to last as long. But you'll have a pretty loud gun.
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