WHAT DOES OCK ISLAND 20 GAUGE SINGLE SHOT MEAN?

SKU 52780129 - RIA's Standard single shot shotgun includes a vent rib, contoured barrel with muzzle brake. It makes use of a woodgrain polymer stock, silver anodized receiver and black barrel.Single Shot arrives back to daily life using this 20" 12GA Rock Island Armory. Vented Rib barrel with barrel chromed inside, this shotgun can't be conquer eve