Which is both reasonable and outrageous when you think about it.
A modern military spec Mossberg or Remington has crept up to the $800, so a faithful replica of a scare WW2 piece might be actually worth that given our market adjustment and limited pool of military surplus shotguns. Look at how fast people were gobbling up the Norinco 1897 Trench gun clones, although cheaper, were not much to write home about.