Disclosed is a method for making a non-metallic, fiber-reinforced barrel tube having particular application for use in a barrel system to be attached to a paintball marker in order to direct paintballs propelled by the marker towards a target. A mandrel is first dipped in a releasing agent. The mandrel is then coated with a thin layer of metal (e.g., nickel or chrome) by means of a nano vapor deposition process. Next, a fiber-reinforced resinous sheet is wrapped over the thin metal layer to establish a tube therearound. A heat-sensitive plastic tape is wound around the tubular resinous sheet. The mandrel is heated in an oven to cause the thin metal layer to bond to the tubular resinous sheet. At the same time, the heat-sensitive tape shrinks to squeeze any air bubbles from the resinous sheet. After heating and curing, the mandrel is pulled outwardly from the tubular fiber-reinforced resinous sheet to produce a hollow, cylindrical barrel tube ready for cutting to size and machining so as to be coupled to the paintball marker.