If we want to understand how Browning Machine Gun, Cal. .50, M2HB works we need to know its purpose and tactical-tehnical feature. Machine gun and machine gun parts functions will be described in this paper. Many parts like tube, the body of the rifle, bolt and aimers that are used in regular rifles are considerably coplicated, bigger and differenent on this machine gun. It is desirable to know this machine gun deadlocks and how to fix them so that you can prevent its further failures. There are many kinds of ammo for Browning Machine Gun, Cal. .50, M2, HB. User maintenance is spent durig daily and weekly checks. Every user of Browning Machine Gun, Cal. .50, M2, HB needs to know how to disassemble and assemble it and how to set forehead gap and the time of firing. Maintenance is spent through first and second tehnical inspection, but if machine gun has bigger failures overhaul needs to be conducted. There are some specifical parts of this machine gun which maintenance is provided. In order to carry out all this maintenance there is also the equipment used. These equipments are measurement and control tools. The tube is the most important part of the weapon and therefore it is very important to evaluate the attenuation of it, and to control and remove it. And finally, we need to know the maintenance steps in the technical workshops.