[El Gato]

The Remington 870 is the best selling shotgun in history.

My brother has one. He's had it since around 1975. The design is even older than that, the 870 was introduced in 1950. You'd think someone, possibly as many as 10 million someones, would have noticed this "design flaw" by now. They built the 10 millionth 870 in 2009, making the 870 the best-selling shotgun in the history of the world.

[MasterGunner01]

There is only one flaw in the 870 design IMHO and that's its ejector. The ejector is a piece of spring steel riveted to the inside left wall of the receiver. [That's what the notch on the left side of the barrel engages when installed.]

If the ejector breaks, and it's happened to me twice (once in the service and once as a civilian), the receiver has to go back to Remington for them to install a new one. Remington will replace the ejector either free or for a nominal charge. This is the only “flaw” with the 870 design. Otherwise, it's about as “human-proof” as you can get with a firearm.