SAS is the model that has the edges rounded off. It is like the blackwood model. I took it to the range and it performed well. I have to practice with it more so I am more accurate with it. The trigger pull is heavy and the handle is short which I believe has caused a larger spread than I would have liked. But I was within 6 inches at about 35 feet. I plan on replacing the plastic trigger with a stainless one to reduce the pull. I also ordered the larger extended mags. All in all I am happy with this gun.