CNC Aluminum Recoil Spring Plug / Guide Rod - Tokyo Marui Hi-CAPA 5.1 / Gold Match The CNC Aluminum Recoil Spring Plug / Guide Rod is machined with precise CNC tolerances from Aluminum and Delrin for improvements in stability, durability and overall performance. They are light weight and specially designed for quick and easy assembly without any tools. With Delrin insert inside Recoil Spring Plug to reduce friction, making movement smoother. Speed up loading BBs. Included: 1 x CNC Aluminum Recoil Spring Plug / Guide Rod Usage: Use for Tokyo Marui Hi-CAPA 5.1 / Gold Match