A blender model of a FABARM SDASS Tactical shotgun. I made this from scratch when I failed to find any good models. It was made from a single picture I found online, so it's not exactly technically accurate. Download the model at:
http://www.peripheralarbor.com/Shotgun_SDASS.blend
or from Google Poly, here:
https://poly.google.com/view/45fnFZz7cJm