CNC Aluminum Hop-Up Chamber - Tokyo Marui Hi-CAPA 4.3 / 5.1 / Gold Match The CNC Aluminum Hop-up Chamber 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. It is designed for better intelligent adjustment and with screw sets on the side and bottom to keep the hop up in place without wiggle. Included: 1 x CNC Aluminum Hop-up Chamber Usage: Use for Tokyo Marui Hi-CAPA 4.3 / 5.1 / Gold Match