Since I have been around a few years longer than the 870, and (before the yacht accident) owned several Wingmasters in each gauge and bore, and have worked on a few here and there, yup, they are a great shotgun.
Two I had went through 750,000 rounds each , one at trap (TC Grade with Grade 8 wood) , the other at skeet (SC grade also with grade 8 wood ) in the late 50-s through the early 90's before I switched to an over/under. One broke a firing pin in all those rounds, the other broke (almost unheard of!) and extractor.
I put all new springs in each of them every 10,000 rounds, kept them cleaned and properly lubed, and they just ran.
The actions are still as smooth as glass, with no slop. Well, smooth once you clean off the encrusted lava from where the yacht sank over the newly formed volcano at the bottom of the Marianna's trench that is!