A spray gun for applying a fluid, comprising: - a body defining a supply orifice for supplying the spray gun with fluid, a discharge orifice for discharging the fluid from the spray gun, and an internal pipe fluidly connecting the supply orifice to the discharge orifice, - a shutoff member movable relative to the body between a release position of the internal pipe, in which it allows the fluid to circulate between the supply and discharge orifices, and a shutoff position of the internal pipe, in which it opposes the circulation of the fluid between the supply and discharge orifices, - a connecting member rigidly connected to the shutoff member, - a coupling member having an engaged configuration in which said coupling member is fixed relative to the body, and - a trigger pivotably mounted about a primary axis (A-A') relative to the connecting member and about a secondary axis (B-B') relative to the coupling member, the primary (A-A') and secondary (B-B') axes being substantially parallel to one another, the coupling member also having a deployed configuration in which the coupling member is translatable relative to the body along a translation direction substantially orthogonal to the primary (A-A') and secondary (B-B') axes, characterized in that the coupling member comprises a slide mounted mobile in translation in a guideway rigidly connected to the body and oriented along the direction of translation, the spray gun further comprising an immobilizing device able to immobilize the slide in the guideway. - a body defining a supply orifice for supplying the spray gun with fluid, a discharge orifice for discharging the fluid from the spray gun, and an internal pipe fluidly connecting the supply orifice to the discharge orifice, - a shutoff member movable relative to the body between a release position of the internal pipe, in which it allows the fluid to circulate between the supply and discharge orifices, and a shutoff position of the internal pipe, in which it opposes the circulation of the fluid between the supply and discharge orifices, - a connecting member rigidly connected to the shutoff member, - a coupling member having an engaged configuration in which said coupling member is fixed relative to the body, and - a trigger pivotably mounted about a primary axis (A-A') relative to the connecting member and about a secondary axis (B-B') relative to the coupling member, the primary (A-A') and secondary (B-B') axes being substantially parallel to one another, the coupling member also having a deployed configuration in which the coupling member is translatable relative to the body along a translation direction substantially orthogonal to the primary (A-A') and secondary (B-B') axes, characterized in that the coupling member comprises a slide mounted mobile in translation in a guideway rigidly connected to the body and oriented along the direction of translation, the spray gun further comprising an immobilizing device able to immobilize the slide in the guideway. the coupling member also having a deployed configuration in which the coupling member is translatable relative to the body along a translation direction substantially orthogonal to the primary (A-A') and secondary (B-B') axes, characterized in that the coupling member comprises a slide mounted mobile in translation in a guideway rigidly connected to the body and oriented along the direction of translation, the spray gun further comprising an immobilizing device able to immobilize the slide in the guideway.