The invention relates to the field of non-lethal, training, sports and playing firearms. The barrel of a sports weapon consists of chamber, the barrel channel, intended for the projectile, an additional channel, designed to pass most of the gas. A cartridge with lateral holes and a narrowed cross section (nozzle or partition) is placed in the chamber in the channel for placing the cartridge in such a way that the holes in the sleeve are located at the mouth of channel, after exposure to the primer igniter of the cartridge, an insignificant part of the formed propellant gases passing through the nozzle and acting on the projectile, causes the projectile to move and throws it out of barrel channel. Most of the generated propellant gases are sent to an additional channel (or channels) and expended on creating effects shot (sound shot, flame) and the work self-loading mechanism. The main idea of the invention - the barrel of a sports weapon - is the separation of the gas flow by means of several channels, one of which is intended for passing the projectile and a small part of the gas, and the other (or others), started from the channel for placing the cartridge, to outlet main part of the gas in the muzzle area of weapons and spending it on creating a shot effect (sound, flame) and the work of self-loading mechanism.