[–] TboneMustafa ago
As one other poster commented it may be your ammo. The problem you describe happens with plated steel head ammunition. Unless you’re using something like AA, Remington Premier or some other ammo with a true brass head the ammo most likely is the culprit. If you’re shooting AA or equivalent and it’s still happening you might have a chamber that wasn’t polished enough. It’s easy to polish, wrap a patch just so it just covers a brass brush, use a thin oil on the patch, rub a non embedding compound into the oily patch(JB is excellent). Then use an adapter to screw the brush into an end of a pistol rod(end peice) and use a power drill to spin the brish(prepared with JB) in and out of the chamber. Do it until the patch basically crumbles into the brush; your chamber is now polished but you may need to repeat the process once or twice more depending on how unfinished your chamber might be.
OP, It sounds like the 870 isn't going completely into battery or lock-up before you fire it. When is the last time you cleaned it down to the component parts? Shotgun powder rarely completely burns. As you eject cases any unburned powder will dump in to the action. Over time it will jam it. I'd start with a thorough disassembly, CLP cleaning, then reassess. While you have it apart inspect the action (slide arms & bolt assy) for any burrs.
It's likely cheap ammo, combined with a dip in Remington's quality control. Buy a box of expensive shells and see if that improves things.
Good casings made from quality materials will expand under pressure, and then shrink back a little, making extraction easy. Cheap materials expand and stay expanded, and if the chamber is rough they can really stick in there. A bad extractor can make things worse.
[–] ilikeskittles ago
Mine is kinda old, but I’ve never had that problem. Bought it in 82? Is yours fairly new?
That's probably it. Remington's quality-control went lower than a Somali's IQ around 2004 or so.
[–] ilikeskittles ago
Yeah, I've heard there are some issues with the newer models. I'm not sure if they can be worked by a gun smith to correct the problem, but i'd suspect it can be corrected. check with a good and I mean good, gunsmith.
[–] Iblis1 ago
me. posted same issue about 2 weeks ago. most people suggested getting a new (non-mim) extractor. i did but was sent the wrong item or id let you know if it worked.
[–] Iblis1 ago
installed the extractor last night and it is throwing unused shell further. i might have a chance to fire it this weekend. but already im hopeful itll work.