If Mossberg utilized a steel receiver, would it be considered better than the 870?
Actually, I consider the 500 the better gun, at least than the express. The Mossy handles better than the 870 IMHO, less receiver weight, a little better pointability. It is certainly finished better. The ergos are MUCH better especially if, like me, you shoot southpaw. It is a rugged, affordable shotgun, nuf said. I have other shotguns, but my 500 is my rough conditions duck hunting fall back. The gun is in camo finish (very rust resistant) and came with a sling/studs, for those long hikes in the marsh when you're hauling deeks and maybe birds.
I like a sling on my waterfowl gun, too, because I'll load the magazine when putting the deeks out ever since I had a close up face to face confrontation with a 350 lb plus wild hog one morning with tusks from hell. Too, this time of year, early teal season, there are the gators. I've had to pepper a gator to run him off, before. I don't like it when the big ones get too close.
See, I wouldn't subject a NICE shotgun to those conditions, a BPS camo at most. But, to take a 2K O/U out there or a 75K side by side? Man, I'd have to be high on crack.
That ain't the place for a gun you can't or don't want to replace. I don't even like taking my old Winchester 1400 Ranger out there and it was a cheap gun. It's kinda pretty, though, with that deep blue finish and checkered wood stocks.
Anyway, that's what the Mossberg 500 is great for IMHO and I'm plenty satisfied with it even though it seems to not have a taste for 3" Remington or 3" Winchester Xpert. It seems a little picky on ammo sometimes. The 3" Expert sticks occasionally on ejection and the Remington is a little long for the ejection port upon firing. Federal never seems to be a problem and 2 3/4" stuff, no problem. I haven't quite figured out why the Xpert 3" sticks like that. I've buffed the chamber with 4 ought steel wool to no avail. Just don't like that stuff. I like the 2 3/4" stuff anyway as it will cycle in my Winchester and it's cheaper and it's plenty effective. But, that's the only thing I have against the gun, a little picky about the ammo it likes.
As to stocks, mine are plastic camo. It's a waterfowl gun, so that's a good thing.