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TheSoaker at WaterWar.net found an image of another 2015 Nerf Soaker Soaker, the Nerf Super Soaker Zombie Strike Dreadshot. In his introductory post, he noted it may be akin to a Nerf Super Soaker Hydrostorm, but I didn't think it has a trigger despite the fact that the box art shows a character firing this blaster single-handedly. As such, I took the image and did some coor adjustments to see if I could find a trigger - the above image currently supports my hypothesis that there is no trigger and that the Dreadshot is a pump-action water blaster.