I feel like these will be useless in all but limited circumstances. A modern battlefield in urban centers will be rife with small and large rubble, making these things unreliable in real world practice when you factor its ability to balance navigating obstacles and dealing with recoil. How does it reload? How long does its battery last? What happens when its weapon jams? Additionally, tricking current AI is fairly simple when you have the resources of a modern military.
Anyway, it's interesting to experiment with, but I just don't think the technology is quite there yet. I think it'd probably be more effective to create self-destructing bomber robot dogs than gun toting ones with our current tech.