I bought a used Mossberg 500 about ten years ago, for $100. It has the 20" smooth-bore Accu-choked barrel. The only modification is I drilled and tapped it for a scope mount. I have a Tasco ProPoint 3 on it. I use this shotgun for deer hunting. I have it sighted in at 50 yards. At 100 yards it holds a 3 inch group, 2-3" below point of aim. Not to bad for a smooth bore and $2 a box Remington slugs.
I just bought a used 28" barrel with Accu-chokes, for $50.00, used.
Around hunting season, I see Mossberg Combos (slug and bird barrels) advertised for $229.00. My local gun shop will not stock new ones, because he can not compete with Walmart or Dicks on price. He always has a few used ones in stock though.
I never had any trouble with my 500. The safety lever and trigger-guard are plastic, but mine have never broken. It has done everything I expected it to. I am not afraid to carry this shotgun through the thickest brush, snow or rain.
I am not one to install the latest gadgets on my weapons, so the lack of accessories, doesn't bother me. The only other modification that I plan for this gun, is to refinish the wood in a non-reflective finish. I am also going to install some sort of rough finish, like grip tape on the forearm / pump. This is to aid in working the action, with gloves on.
If I was going to buy an other shotgun, prices being equal, I would go for the 870 next. There is nothing wrong with the Mossberg, but I think the Remington is a little better. I would still keep my Mossberg as my don't worry, take anywhere shotgun.
OSA