Firearm with at least two superimposed barrels linked together by a band (3) except over a length as of the mouth of the barrels (1-2), with the converging front parts of the barrels (1-2) if are not separated under tension, characterized in that the band (3) is fixed to the lower barrel (1) practically up to its mouth or up to its mouth, but is released from the upper barrel (2) at a distance from the mouth, the barrel being upper (2) surrounded at the front by a ring (6) which separates it by elastic deformation of the band (3) and therefore, the lower barrel (1) and that the ring (6) is held in place by the foot of sight (10) which is fixed to the tip of the upper barrel (2).
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