The CNC Aluminum Hopup Chamber V2 is machined with precise CNC tolerances from 7075 Aluminum for improvements in stability, durability and overall performance. Specially FPS be increased about 5-15 more. The knob can be moved step by step for easier adjust. The nub is made from solid aluminum helping the travel is also increased compared to the old version. Compatible with more inner barrels and bucking than the old version. With the set screws keep the hop up in place without wiggle. Included: 1 x CNC Aluminum Hopup Chamber V2 Usage: Use for Tokyo Marui Hi-CAPA 4.3 / 5.1 / Gold Match / 1911