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. his All Purpose Field Youth Bantam model has a walnut stock with a shortened,12.5" LOP, 24" 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.