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 (T) 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 (T), 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 (T) 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 (T), 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 (T) 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 (T), the spray gun further comprising an immobilizing device able to immobilize the slide in the guideway . <EOS>