My apologies and NEVER have I said I was an expert. I figured that is why we are here to share our collections and experience. Sorry that bothers you and I don't post every shotgun thread. But you got it wrong it is more like strong willed and experienced and not from the internet
But since you started it actually I only ever got to 304

when my dad passed and I added his collection of which most were shotguns to mine but I have reduced the herd big time by 2/3 in the past 5 /10 years due to my age

but still have enough to yack about them and most of our wingmasters are still with me. I have never collected one gauge of any make but the set of each from 410 to the 10ga if available like a bps for example
An express can be in some cases a piece of crap IMO compared to a wingmaster and should never have been called a 870 there is where the problem started and I agree with you no gun should require polishing to make it work. Then again for the price if it goes bang and gets people shooting nothing wrong with that
Sorry if my posts offend you but there are not too many quality shotguns in pump version I don't still have a sample of since I loved pumps of all makes and have been collecting and working on them since the 60's in my dad's shop plus with an engineering background gives me a bit more knowledge around these than most . If that comes across as stubborn and opinionated so be it but it is NOT based on owning one 870 and from that determining that remington 870 shotguns are crap as some do here
IMO most unfortunately have never owned a true Remington 870 as us old guys know them . Sounds like you have had at least one so might know what I mean
Cheers