Mossberg SA-28 All Purpose Field, Semi-automatic, 28 Gauge, 2.75 Chamber, 26 Barrel, Blued Finish, Walnut Stock, Right Hand, Vent Rib Barrel, 5 Choke Tubes - F,IM,M,IC,C, 4Rd 75792 The Mossberg SA-28 is a lightweight, soft shooting 28 gauge sporting shotgun that is perfect for both hunting and target shooting. The SA-28 has a smooth cycling semi-automatic gas operated system.