GML Visual Playing the Full Animation with Just One Button Press

Hey, I'm new to Game Maker and I'm working on a horizontal shmup. I wanted to implement a shotgun blast animation, but the animation I created will abruptly stop when I let go of the keyboard key I have it assigned to, and the animation will resume when I press it again. I want it so that the entire animation will play after just one button press, with no possibility of looping even when the key is held down. I have it set so that the Z-Key event uses the change sprite action to play the animation. If you want me to put more info, let me know. Also, please describe with the DnD interface. Thanks.
 
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