A toy water gun actuation mechanism for controlling opening of a valve with a valve member wherein the valve member has a closed position and an open position, the water gun actuation mechanism comprising at least: - a base, - a trigger, being movably supported relative to the base and having at least an actuated position and a non-actuated position, - a coupling member being configured to be connected or being connected to the valve member and/or to a valve member connection rod, wherein the coupling member is movably supported relative to the base at least from a first position to a second position; characterized in that - a blocking member with an abutment is movably supported relative to the base and relative to the coupling member wherein the blocking member has a blocking position and a non-blocking position, - the mechanism is configured such that if the blocking member is in its blocking position and if the coupling member is in the first position, then the abutment is positioned in trajectory of the coupling member defined by a movement of the coupling member from the first position into the second position, - and if the blocking member is in its non-blocking position, the abutment is located outside the trajectory being defined by the movement of the coupling member, - a first elastic member is connected to the trigger and to the coupling member, wherein the potential energy being stored by the first elastic member is increased, if the trigger is moved from its non-actuated position towards its actuated position while the coupling member is maintained in its first position by the blocking member, - the trigger has a pusher dog configured to move and/or release a movement of the blocking member from the blocking position into its non-blocking position if the trigger is moved from its non-actuated position towards its actuated position. - a base, - a trigger, being movably supported relative to the base and having at least an actuated position and a non-actuated position, - a coupling member being configured to be connected or being connected to the valve member and/or to a valve member connection rod, wherein the coupling member is movably supported relative to the base at least from a first position to a second position; - a blocking member with an abutment is movably supported relative to the base and relative to the coupling member wherein the blocking member has a blocking position and a non-blocking position, - the mechanism is configured such that if the blocking member is in its blocking position and if the coupling member is in the first position, then the abutment is positioned in trajectory of the coupling member defined by a movement of the coupling member from the first position into the second position, - and if the blocking member is in its non-blocking position, the abutment is located outside the trajectory being defined by the movement of the coupling member, - a first elastic member is connected to the trigger and to the coupling member, wherein the potential energy being stored by the first elastic member is increased, if the trigger is moved from its non-actuated position towards its actuated position while the coupling member is maintained in its first position by the blocking member, - the trigger has a pusher dog configured to move and/or release a movement of the blocking member from the blocking position into its non-blocking position if the trigger is moved from its non-actuated position towards its actuated position.