USED   The Mossberg 500A is essentially the standard 12-gauge model within the iconic Mossberg 500 pump-action shotgun series, known for its simple, rugged design, dual action bars for smooth cycling, ambidextrous top-mounted safety, and versatility for hunting, defense, and sport, differing from other 500 models primarily in trim, finish, and included features like barrels or sights, but sharing the same reliable core action.  USED