A biopsy gun having a cannula and a stylet guided in the cannula , the biopsy gun further comprising: a housing , a cannula carriage for moving the cannula , a stylet carriage for moving the stylet , a tensioning grip for tensioning the cannula carriage and the stylet carriage from an initial position to a tensioning position, an engagement element which is provided on the tensioning grip and has recesses which can engage with corresponding projections of the cannula carriage and the stylet carriage , wherein the engagement element is rotatably mounted on the tensioning grip and is pretensioned against a contact surface of the housing by means of a spring , the tensioning grip has a section which rotatably supports the engagement element and has a spring-receiving hole , the engagement element has a spring-receiving groove , a first end of the spring is inserted into the spring-receiving groove and a second end of the spring is inserted into the spring-receiving hole , wherein the engagement element has a cannula-side recess and a stylet-side recess , the cannula carriage has a cannula-side projection and the stylet carriage has a stylet-side projection , wherein the cannula-side projection is closer to the engagement element than the stylet-side projection , at least in the initial position, wherein the engagement element , the contact surface , the cannula-side projection and the stylet-side projection are designed such that, in the non-actuated position of the tensioning grip , the engagement element is held by the spring and the contact surface in such a rotational position that the cannula-side recess is engaged with the cannula-side projection , so that, when the tensioning grip is actuated, the engagement element is rotated towards the side of the cannula-side projection by the engagement between the cannula-side recess and the cannula-side projection against the spring force, so that the stylet-side recess cannot engage with the stylet-side projection when the cannula carriage is tensioned. a housing , a cannula carriage for moving the cannula , a stylet carriage for moving the stylet , a tensioning grip for tensioning the cannula carriage and the stylet carriage from an initial position to a tensioning position, an engagement element which is provided on the tensioning grip and has recesses which can engage with corresponding projections of the cannula carriage and the stylet carriage , wherein the engagement element is rotatably mounted on the tensioning grip and is pretensioned against a contact surface of the housing by means of a spring , the tensioning grip has a section which rotatably supports the engagement element and has a spring-receiving hole , the engagement element has a spring-receiving groove , a first end of the spring is inserted into the spring-receiving groove and a second end of the spring is inserted into the spring-receiving hole , wherein the engagement element has a cannula-side recess and a stylet-side recess , the cannula carriage has a cannula-side projection and the stylet carriage has a stylet-side projection , wherein the cannula-side projection is closer to the engagement element than the stylet-side projection , at least in the initial position, wherein the engagement element , the contact surface , the cannula-side projection and the stylet-side projection are designed such that, in the non-actuated position of the tensioning grip , the engagement element is held by the spring and the contact surface in such a rotational position that the cannula-side recess is engaged with the cannula-side projection , so that, when the tensioning grip is actuated, the engagement element is rotated towards the side of the cannula-side projection by the engagement between the cannula-side recess and the cannula-side projection against the spring force, so that the stylet-side recess cannot engage with the stylet-side projection when the cannula carriage is tensioned. <EOS>