Breech and method for noise reduction

A breech for noise reduction in a recoil-less weapon, the breech being adapted to be arranged in fluid communication with a launcher of the weapon to release exhaust gas, the breech comprising:

• a venturi tube structure having an inlet at a first end adapted to be connected to the launcher, and an outlet for releasing the exhaust gas at a second end, wherein the area of the outlet is larger than the area of the inlet;
• and
• exhaust gas controlling element formed at the venturi tube structure, said exhaust gas controlling element being arranged to control the release of exhaust gas so as to decrease a sound pressure peak at the weapon,
• wherein the inner envelope surface of the venturi tube structure is configured, such that the inner envelope surface does not alter or at least has a very small influence on recoil characteristics of the weapon, and wherein the exhaust gas controlling element formed at the venturi tube structure is arranged to control the release of exhaust gas so as to
• successively release high pressure gas and/or
• reducing radial pressure distribution and/or
• obtain destructive interference and/or
• obtain additional area enlargement.