WHAT DOES OCK ISLAND 20 GAUGE SINGLE SHOT MEAN?

SKU 52780129 - RIA's Regular single shot shotgun includes a vent rib, contoured barrel with muzzle brake. It utilizes a woodgrain polymer inventory, silver anodized receiver and black barrel.Single Shot arrives back to lifestyle with this 20" 12GA Rock Island Armory. Vented Rib barrel with barrel chromed inside of, this shotgun can't be defeat even