The spray gun extension gun barrel is a professional spray equipment accessory designed to enhance the operational flexibility and adaptability of the spray gun. By extending the effective operating distance of the spray gun, the extension rod enables the operator to perform precise spraying in a wider working area, avoiding frequent equipment adjustments or personnel movements. The extension rod is connected to the spray gun host through a precision thread or quick-connect interface to ensure a tight, stable and not easy to loosen connection. The spray gun extension gun barrel is often designed to be adjustable in length. Users can adjust its length range according to different working environments. This extension rod is also equipped with a rotating head or an angle-adjustable device, which enables the spray gun to perform precise spraying in narrow or hard-to-reach corners.