A muzzle brake for a gun tube, the muzzle brake comprising: a body having a top plate and a bottom plate, which extend from an inlet end having an inlet aperture to an outlet end having an outlet aperture; a support hub defining an inlet end and an outlet end, wherein the hub outlet end extends to/from the body inlet end; and the body and support hub define a longitudinal bore which extends through the body and the support hub between the support hub inlet end and the body outlet end, the bore being centred on a longitudinal axis; the body further comprises a first wall section, a second wall section and a third wall section which extend from the top plate to the bottom plate; wherein the first wall section defines the body inlet aperture; and the second wall section extends from the first wall section along the longitudinal axis and extends to a first baffle which defines a bore aperture, a first chamber being defined between the body inlet aperture and the bore aperture; and the third wall section extends from the second wall section along the longitudinal axis and extends to a second baffle which defines the body outlet aperture, a second chamber being defined between the first baffle and the body outlet aperture; the first wall section, top plate and bottom plate diverge away from the longitudinal axis in the section of the first chamber which extends from the hub outlet; the second wall section, top plate and bottom plate converge towards the longitudinal axis and the first baffle, such that the second wall section, top plate, bottom plate and first baffle define a first compression cone; the third wall section, top plate and bottom plate converge towards the longitudinal axis and the second baffle such that the third wall section, top plate, bottom plate and second baffle define a second compression cone; and the body defines a pair of outlet ports (250; 350) for each of the first chamber and second chamber, each pair of outlet ports (250; 350) facing each other on opposite sides of the longitudinal axis; characterized in that each of the pair of outlet ports (250; 350) have a divergent outlet nozzle (252; 352) defining their periphery. a body having a top plate and a bottom plate, which extend from an inlet end having an inlet aperture to an outlet end having an outlet aperture; a support hub defining an inlet end and an outlet end, wherein the hub outlet end extends to/from the body inlet end; and the body and support hub define a longitudinal bore which extends through the body and the support hub between the support hub inlet end and the body outlet end, the bore being centred on a longitudinal axis; the body further comprises a first wall section, a second wall section and a third wall section which extend from the top plate to the bottom plate; wherein the first wall section defines the body inlet aperture; and the second wall section extends from the first wall section along the longitudinal axis and extends to a first baffle which defines a bore aperture, a first chamber being defined between the body inlet aperture and the bore aperture; and the third wall section extends from the second wall section along the longitudinal axis and extends to a second baffle which defines the body outlet aperture, a second chamber being defined between the first baffle and the body outlet aperture; the first wall section, top plate and bottom plate diverge away from the longitudinal axis in the section of the first chamber which extends from the hub outlet; the second wall section, top plate and bottom plate converge towards the longitudinal axis and the first baffle, such that the second wall section, top plate, bottom plate and first baffle define a first compression cone; the third wall section, top plate and bottom plate converge towards the longitudinal axis and the second baffle such that the third wall section, top plate, bottom plate and second baffle define a second compression cone; and the first wall section, top plate and bottom plate diverge away from the longitudinal axis in the section of the first chamber which extends from the hub outlet; the second wall section, top plate and bottom plate converge towards the longitudinal axis and the first baffle, such that the second wall section, top plate, bottom plate and first baffle define a first compression cone; the third wall section, top plate and bottom plate converge towards the longitudinal axis and the second baffle such that the third wall section, top plate, bottom plate and second baffle define a second compression cone; and the body defines a pair of outlet ports (250; 350) for each of the first chamber and second chamber, each pair of outlet ports (250; 350) facing each other on opposite sides of the longitudinal axis; characterized in that each of the pair of outlet ports (250; 350) have a divergent outlet nozzle (252; 352) defining their periphery.