An improved barrel for paint bullet gun has several ring rifle partitioners in the inner wall and several air exhaust grooves between the partitioners. The top of the rifle partitioners forms the bullet passed space resulting in reduced contact area of the bullet with the barrel inner wall. The present invention can reduce resistance to paint bullet via dredging air flow and thus increase the shooting distance. The reduce friction force and decrease the breaking capability of paint bullet. In addition, the present invention has the function of cleaning bullet residue autoamtically. |