A non issue.
Any of those will last longer than we, given some PM and TLC.
Ad that includes the bargain basement po' relation of the 500, the Maverick.
A couple examples.....
Anecdotal evidence I see repeatedly states the receivers on 870s used for trap oft start cracking at the rear of the ejection port at about round 250,000.
Remington used to replace these, but currently they just tell you to buy another. I can relate to that.
And, when the state of MD opened a prison in 1981, they put two 870s aside for training weapons. Average monthly shell use was 500 to 1000 rounds between pre service and requals.
Each.
As with most agency weapons, cleaning was slapdash for the most part and done by under motivated, non firearm cognizant, lackadaisical people.
When I retired in 1998, the only parts replaced on one weapon was the lumber. The other had rotated into the towers and was on duty with the rest.
Performance was flawless.
A good friend shoots a Model 12 he's had for decades. A trap model built in the 30s and that's what he uses it for. He's a truthful sort, and says his records indicate he's run 230K rounds through it. Not trouble free, it had some trigger issues requiring shop time with a very good smith.
Two acquaintances are brothers, and share the custody of a well worn Model 97. It has little blue left, the bead had been replaced a few times and they gave up and soldered on a ramp when the metal wouldn't take the thread tap any more. Other than that and a few strip and cleans at a smith over the decades, it's been trouble and PM free since before WWI.
97s are not known as the smoothest shuckers, but this one mimics butter. It has taken everything from deer to squirrels and sat behind the door on a Appalachian cabin, just in case.
And while 37s are not range tools,mostly, I know of several that are on third and fourth generation owners and have lots of stories in them we'll never get to hear.
I have lots of input and decades of experience with shotguns. I can recall only a few lemon pump guns.
There was the Noble. Someone had been smoking tar paper shingles when they thought up that mess.
The best description I ever heard of came from a smith who, despite expertise in his field, refused to work on them.
"The Noble is a poorly designed and made hunk of trash that must have been thought up in the Kremlin to frustrate American shooters. Toss this piece of junk away and get you anything else".....
Some of the older Savages were problematic. I can't recall which models at this time. The Browning designs weren't the problems.
Same with the Springfields, owned by Savage.
Early S&W shotguns made in Japan had the rep of being Divas, but the ones I've seen in private hands worked well. As Agency arms, they faded fast.
That's about it, get anything else and you'll likely be happy with it and so will your grandkids.....