FIELD: small firearm and artillery weapon, in particular, barrels with muzzle adapters and concentration. SUBSTANCE: barrel muzzle section has a cylinder-slotted release of gases with a cylindrical inner surface and through longitudinal slots. The slots are directed radially or inclined to the another providing for open outflow of gases into the atmosphere. The slots may be closed from the outside by a sleeve or sealed enclosure. EFFECT: simplified design enhancing the close grouping of shots, even small-shot shattering, reduced recoil, deformation of shell, flame and shot noise. 5 cl, 6 dwg
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