The venerable AK-47 assault rifle if it were a pony, drawn for a competition held by - to make a pony out of an inanimate object. Magazine-styled saddlebag, bayonet, green eyes to represent tritium iron-sights, and auburn hair/boots to represent wooden furniture. I suppose she could be used as a weapon like Twilight was by Pinkie in "A Canterlot Wedding"?
I wanted to render a pony that would suggest an object, rather than an object a pony... although that approach probably just resulted in a pony trying to cosplay the object I'll let *fireflytwinkletoes figure the eligibility of this one out, haha.