Essentially, nothing went wrong.
Every new product is a hit or miss proposition.
One could ask the same thing about the .45 GAP. Offers some distinct advantages over the .45 ACP re: size of grips.
Yet it is, for all intents and purposes, dead.
Doesn't matter if it has great credentials or not. If people look at it and heave a collective sigh of "nice, but meh," it's going to fail.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.