I know I'll get flamed for this, but new 870s suck.
Sure 90% work flawlessly, but even if only 10% are bad, that is way too high. It is well documented...Remington just doesn't have good QC. There are similar complaints about newer Marlins made since Remington bought them out...same stuff, different day.
You all can say whatever you want, but they stink in my opinion.
Light travels faster than sound. This is why some people appear to be bright until you hear them speak.