They are certainly interesting. Don't know how they are being marketed over there. Over here, my understanding is that you get the baffle stack welded to the short barrel to bring it to legal length, but the tube requires registration. I think it is a fascinating, if mildly unwieldy, way to market the rifle to the NFA community. I do wonder how many folks are going to purchase it and never buy the tube. The last time I spoke to my former distributor, he was under the impression that only the MPX-C was going to be available, with all the other models being select fire. However, recent ad copy I saw showed the MPX as also being available in semi-auto. I'd be more interested in that model, depending on price, than the C model.