Mossberg 500 or 590 is a low cost good bang for the buck shotty. They are fairly cheap, but reliable, and come with numerous factory options from heat shields, ghost rings, different grips, pistol grips, collapsible stocks, storage speed-load stocks. I am special ordering one currently. In Cali you need a minimum overall length so for me to do pistol grip I have to have a 20" barrel instead of 18.5 or less. I am getting a marinecoat 9shot
but they do make it in blued as well, and they also make a 6shot collapsable tactical stock.
Or if they have it in your area you can get the Just In Case series that come with like multitools or survival kits
But like I said, I like having the 9-shot capacity, any of them can be modified with any stock, from low key to full tactical. But I will either get the Mako or Hogue grips and foregrips on the Marinized finish so it is a lil more weatherproof and comfortable on the grips. Still haven't decided on sights/rail option