Mossberg's SA-20 uses a smooth cycling, gas-operated system for a lightweight, soft-shooting 20 gauge shotgun perfect for both hunting and target shooting. This All Purpose Field model has a walnut buttstock and forend with a 14.5" LOP, 26" vent rib barrel with a matte blued metal finish, and a metal bead front sight. It includes Mossberg International's Sport Set of 5 choke tubes.