Sig took their immensely popular P365, and turned it up a notch. The SAS features a ported barrel, and slide, along with one of the most innovative sight systems out there. You'll notice that there is nothing interrupting the top line of the slide to hang up on a draw. The sight is an amazing fiber optic system housed flush at the rear of the slide, and needs to be experienced in person to truly appreciate. Everyone we've showed it to comes away saying "Wow!!".