Bought a brand new model 887 nitro mag 2 weeks ago. Tried it out on some clays along with some
buddies with their guns. First 10 shells (Winchester 2 3/4in 1 1/8oz shot) no problem. Then hell broke loose. At first every 2nd to 3rd shell would hang just before entering the chamber, then it went to every shell, and pulling the pump back to dislodge it is a joke in itself because as we all know, if there are any shells left in the tube, they all fall out also. So, after hanging 12 new shells, and while the buddies are havin a great time shooting up all my skeet, I commence to disassembling this thing. I found a small burr on what I can only describe as a small rectangular wear plate (lacking all the correct terminologies),on the inside top of the barrel extension. Machining defect. Partially understandable. Filed it off. Not even close to being done yet... Reassembled the gun, almost solved the problem, with "only" 1 hang before entering chamber in approximately 10. NOW, 1 in every 4 to 5 shells jam after being fired resulting in a 200lb man setting the butt on a tailgate and pulling down on the pump with both hands to eject the spent shell. I'm unsure if the shells themselves were hanging, or if it is the pump action itself, so I tried a different brand of ammo, same thing. Completely disassembled the gun, inspect-clean-oil. Reassemble. Didn't help. Here's the kicker... Looking straight down the gun from the stock, there is a machined ridge down the top of the reciever. This does NOT line up with the barrel. Matter of fact, the deviation is 1/4 inch from the butt to the end of the barrel. All firearms checked before boxing? Winchester, HOW do you not notice a bent shotgun that doesn't load NOR eject shells? Called the hotline, "send it in and we'll check it out. Have it back in three weeks." Check it out, Winchester, YOU built it. And not that this is your concern, but I've already paid for the dove hunt that I purchased this gun for, so now I've got to go buy another gun. A different brand, of course.

Welcome,
Take a look at other post in this section , they address most.. but its safe to say you can call Remington and explain your issues.
I had to give a thorough cleaning and improved just about all issues. Also removed that use less actions support..(it looks like a W when you remove the pump during disassembly and is located between the two bars/rails that slide in to the action).

see the attachment, I put a big red w on it. You may not even had it.. but my 887 shipped with one and it was horribly jamming until I removed it.

Sorry I meant Remington, not Winchester, happen to be looking at the box of shells while typing. Thanks for the response, I will give that a try

Had the exact same issue. This was because the chamber was too tight, the shells brass would get stuck very hard in there.

I used fine polishing tool on a dremel to take out just a bit off the walls around the chamber and not a single shell got stuck afterwards.