Rifle Firearm Rossi S20, #9p567020, 20 Gauge, Semi-Automatic; Rifle The S20 shotgun is a dependable, well-built firearm known for its durability, simple operation, and timeless design. Whether you're looking for a dependable field gun or a classic addition to your collection, the S20 offers solid performance and reliability. It has been inspected for functionality and is ready for its next owner, subject to all applicable federal, state, and local laws.