How about a placeable turret like weapon similar to a mech, it starts out as a gray metal box , and once you place it, it unfolds and acts a friendly turret, the puppy would have limited health, which would go up the higher the tier grade, it would go from tier 1 to tier 3, deal normal, at tier one it would shoot one bullet, at two 3 bullets and at three 5 bullets.
i know it is a sorta wacky idea, but i would love to hear your thoughts
Considering the long pause between shots of the original gun puppy (plus chance of missing, and the fact that it only covers one angle at a time) it'd kill slower than a shivermist.
Now if it's something like this... http://wiki.spiralknights.com/Mecha_turret