CNC Brass Matte Surface Hopup Chamber - Tokyo Marui Hi-CAPA 4.3 / 5.1 / Gold Match / 1911 The CNC Brass Hopup Chamber is machined with precise CNC tolerances from Brass for improvements in stability, durability and overall performance. With matte surface, the hopup chamber can be scratch resistant. And 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 hopup in place without wiggle. Included: 1 x CNC Brass Hopup Chamber Usage: Use for Tokyo Marui Hi-CAPA 4.3 / 5.1 / Gold Match / 1911