I currently own three 870 Wingmasters.
I had 4 at one time. I sold that 4th one. It was a 12ga Magnum model purchased in the early 1970s. The magazine spring weakened over time, and with heavy 3" lead magnum shells, the shells wouldn't reliably be shoved back onto the follower. So after shooting a first shell in the chamber, I'd end up dry firing on an empty chamber for my second shot. Rack the action again and it would feed from the mag again and fire again aftrer that 3rd effort.
I solved that problem with a new magazine spring.
Next problem I experienced was 3" Remington Peter's shells wouldn't clear the ejection port. The mouth of the fired, opened cases were too long to clear the front of the ejection port.
I sent the shotgun to Remington. Told them the issue I was having. Fired Remington Peters 3" Mag shells wouldn't clear the ejection port on their 12ga 870 Wingmaster Magnum model shotgun.
They said their experienced gunsmith inspected the shotgun and found nothing wrong. I sold that 870. Then 20 years later, Remington was bankrupt.
Haven't had any problems with my other three 870s. Two are 20ga Lightweight models. The 3rd is another 12ga Magnum model. But after the problems I had with the one 870 I sold, I researched 870s and bought new mag springs for the others. I also upgraded some other parts on all 3, to help ensure reliability for home defense and bear defense uses.