Spandau Arms S2 Field Full Size 20 Gauge Semi-Auto 3" 3- 2.75" Shells 28" Black Vent Rib Barrel, Black Drilled & Tapped Receiver, Fixed Wood Stock, Benelli Choke Tube System The Spandau S2 Shotgun operates on a Inertia operating system for smooth cycling with various loads Features fiber optic front sight; oversized controls; enhanced loading gate and compatibility with Benelli M2 accessories. Includes adjustable drop/cast spacer kit, owner's manual, wrench, Benelli choke tube kit- Cylinder, Modified, Extended Ported Modified and Full.