I have carried an 870 for years. This is your problem. Don’t mess around with the pump, pump that sucker like you mean it. You can’t pump an 870 slow. Mine kicks so dang hard with a 3.5” mag though you don’t have to think about it, it pumps itself. Lol

Classic consequence of a “short stroke”. Be sure to cycle with authority all the way to the back of the slide cycle.

Did he even go past the shell stop in the first place might be a heat of the moment loading mistake!

Short chucked is what it looks like from where I am sitting

Guys read the question. Pull the dang shell put the other one in the pipe and smoke that thunder chicken. That is how you remedy that problem.

Yes I seem for forget to pump the 870 hard but everyone tells me to do this. Yet I still don't and get jams.

Yep, I have even used the tip of a knife while in the field to push the bottom shell into the tube.

Push the two trigger pins out and remove the trigger group. jammed shells should fall out.
If this is a one time deal it may be a shell sizing problem. Lots of that out there these days.

More than once the ejector or assist spring is done.

Yep, same thing happens with my winchester 1300 when I short pump.

when the old wingmasters did that the wooden dowel in the magazine gets swell spots causing it to get sluggish sand paper and oil fixs it. 870S are one tough gun! That gun alone put Remington in the history books. If my extrema fires as many rounds as my old magnum 870 ill be happy and dead!

Mine has done that with 2 3/4 and 3 inch shells happens most often when I am trying to change around for some reason and not trying to kick out a shell or feed a new one. Just push bottom shell forward with a knife blade and yank the top shell out. Or if its really stuck pull trigger group out, I think I can do that with out the gun being in battery. I have not had the problem in years I just pick my shells out of the dirt and wipe them off. It's an 870 it don't care how dirty they are.