The AR180B has been around at least 6-7 years, at least my faulty memory recalls selling one at least that long ago. Nice little gun, but I think what separates it from the latest wave of impingement / piston guns is that it is bare bones. It does not have all of the "cool" stuff hanging on it such as 4 rail forearms, flip up sights, grips, etc. The sutff that all looks cool in print ads and internet ads. POF has guys hanging out of helicopters holding their guns in Shotgun News, for example. Looks cool, but isn't very realistic.
On that line, I wonder how much the impingement / piston systems would be if they were sold as bare bones uppers only? If these companies would offer just uppers at a lower price, people might be more willing to buy one and test it out. That being said, most of these companies have a current 3-4 month weight for their products, so a lot of people are buying them and perhaps the companies don't really need to offer a bare bones price break.
"Piston ARS" like the FNC, AR180, SIG550 series,and the Daewoos have all been available in the past and nobody wanted them! Okay I realize these are not all ARs but you get my point?