Looks like a really cool concept, but how will it hold up with though use? And how about the regualtion of all the different barrels, as NitroX mentioned. I see how much problem many people have regulating their regular free floating barrel double rifles, and how much time and ammunition they use to get the job done. And this one then with interchangeable barrels and parts must be a nightmare, but if they have found a way to make it ingeniously simple, this will be a success. But I`ve seen a Norwegian concept that looked a little like this with a shotgun barrel at the top, and pump rifle at the bottom, but that one went out of production pretty fast.