Initially, 3D models were provided for the barrel without and with cooling channels. When running the analysis, the models were converted to 2D models. Thus, the problem is converted into a 2D axisymmetric problem. A two-dimensional heat transfer analysis of a barrel was performed using Pro/Mechanica FEM software. Firstly, the analysis was carried out for the barrel without cooling channels then for the barrel with cooling channels. The following steps were followed during each analysis