The HP9/Grizzly and 780 Homeland Security are all Norinco, but the latter is junk. The former are on par with or superior to a Remington 870 Express by all accounts, barring the finish. Buy a Norinco HP9 or Dominion Grizzly with confidence. Don't buy a Homeland Security 780 if you want something that will work or last.
If I remember correctly, one of the sponsors was selling 780s in pairs....One that sort of worked, one for parts. That's not to say SOME of them aren't decently reliable, but it seems like luck of the draw in terms of getting one made of all the right parts.