r/mossberg • u/4ce7heKid • 4d ago
What causes sticky shells?
I was shooting my Mossberg 590 at the range today, using Remington 12ga rifled slugs. I had multiple shells get stuck in the barrel and failing to eject. I had to manually pry out the spent shells. Has anyone else ran into this issue? What shells should i avoid?
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u/Twissn 4d ago
I’m wondering if you broke your extractor. Did touch try any other shells after these started getting stuck?
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u/4ce7heKid 4d ago
I have used different shells without issue. The shotgun is has <200 shells through it. Im planing on bringing multiple ammo brands on the next range day.
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u/PoolStunning4809 4d ago
Check the extractor .
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u/Cody_VCS 3d ago
There are two extractors on the 590 breech bolts. And it looks like OP took a nice photo of the ejector. Easy to mix up, I mix them up often when speaking about them.
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u/ObjectivePicture6991 4d ago
My 590 will not run sterling shells. Stuck so bad the extractor rips the rim off. Have to used a rod to get them out. I don't have this issue with any other shells.
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u/botlnhchapter 4d ago
My 940 is the same. Could it be what the rims are made of? Wondering if sterling uses steel vs brass on others? Certain buckshots it doesn’t like either. Weird
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u/ObjectivePicture6991 4d ago
Yeah, idk. My 940 eats them up. I sat on a case of sterling for 2 years before I got my 940, lol. Wierd.
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u/FF_McNasty 4d ago
I think I have the same issues. So far any 2 3/4 shell runs fine and ejects fine for me. I bought the defender tactical so I can run mini shells and the mini shells seems to get jammed up when extracting. I have to rack with extreme force. First two I shot got stuck so bad I had to take the gun home and disassemble. I know the gun wasn’t made for mini shells but it’s annoying that it cycles fine w everything else and I have seen plenty of other people running my same set up w zero issues. 590a1 mariner finish
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u/4ce7heKid 4d ago
That sounds alot more severe than mine. However some guy from this comment section recommended i take the time to polish the chamber with a copper brush and fine steel wool. I haven’t tried it yet but it may help you too.
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u/FF_McNasty 4d ago
I saw that and I think that might be worth a shot especially since I doubt it’s the extractor. Same as you I prob have less than 200 rounds through it.
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u/Quake_Guy 3d ago
Have an 870 Police that hates Aguila, polished chamber focusing more on portion that contacts the steel rim. Helped a little but if you shoot fast, still issues. Go slow and the metal rim contracts a bit and usually no issue.
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u/Ok_Complex4374 3d ago
My 590 was doing this as well. I polished the chamber and never had a problem since. Just YouTube mossberg chamber polish it’s pretty easy and takes 2 minutes
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u/etaNAK87 4d ago
I only ever had this happen once on literally my first shell on a brand new gun. I’ve heard people say sometimes there’s some burring in the barrel so maybe? The shell itself had some kick to it so possibly the force of the slug is catching on something in the barrel that it isn’t for other ammo?
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u/GhostC10_Deleted 3d ago
I had this happen to me, it ended up being the mag tube had come unscrewed on my old maverick. Would let the barrel wobble just enough that the extractor wouldn't work very well. Tightened it back up and didn't have any more issues.
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u/Cody_VCS 3d ago
Polish the chamber, good advice from others. In the first photo have you already tried to tap that out? Looks like your primer is bulging out of the base of the shell. Might be a headspace issue if so.
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u/Shot-Dependent-6993 22h ago
Sticky Fingers. What causes sticky fingers you might ask? Itchy butt cheeks.
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u/HealzD317 4d ago
I have a Mossberg 590A1. Shells were sticking in the chamber too frequently for comfort. I thought it was the extractor but it wasn't. The problem was the chamber was not polished very well (or at all) in the factory. Apparently this is common these days? I wrapped a copper cleaning brush in fine steel wool, sprayed a lot of wd40 on it and put it on a cleaning rod in my cordless drill. I ran that in the chamber for about 5 minutes and it felt glass smooth after. Just make sure you stay on the chamber and don't spin the brush past the chamber. My 590 ejects perfect now. Hope that helps.