Mossberg Maverick 88 jamming in magazine tube & barrel

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Hi all. My Mossberg Maverick 88 I bought a bit less than a year ago, is suddenly frequently jamming & not cycling, both in the magazine tube below not cycling live shells from magazine tube into barrel chamber when pumping the forearm assembly.
And a shell even stuck ( at least after it fired ) near the trigger end of barrel after it was fired, instead of ejecting out.

Maybe coincidence, but I used a cleaning rod with brush and cloth to do my first general cleaning / oiling of inside of barrel between previous use at range and this most recent time a few days ago when it was jamming. Maybe i didn't clean it correctly? I didn't take it all apart, just removed barrel and reattached it after cleaning.

This recent time at range i used a few different rounds, mostly Remington, Fiocci and something else i dont remember. 2.75" & 3". I never use longer than 3" shells.


I made a ( somewhat long ) video -



showing at beginning of video showing after issues at range, when back indoors trying it with dummy rounds and still malfunctioning. And during at range when it shot successfully first few times, then began malfunctioning and a working at range came over and looked it it for a bit. He suggested taking it to someone at 29 Outdoor. Though I prefer to fix it myself if possible and safe to do, given the business charges a $80 base fee plus whatever else they do and time they spend, which Id rather not pay so much. Could easily cost enough to buy a new guy again.

Any suggestions as to why its doing this and how to fix?
 
The gun needs an adjustment of the shell stop. It is a simple job that only takes a few minutes. I have done a lot of them. No big deal for anybody that knows the gun and the issue. Problem is not rare, and easy to fix. Your range officer doesn't seem to know much about it. He is not a smith, he is a safety official. Find someone familiar with how the gun works. Empty rounds not extracting can be a couple different things, ammunition related, chamber either dirty or needs polishing, extractor spring, or extractor.
 
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Most likely the shell stop, as mnrivrat says. There could be several other factors: While you are wroking the pump vigorously, it looks like you might be 'short shucking' it. This means working the action not quite to the full length of the pump's travel. There are cutouts on the bottom of the action bars that work the shell stop and interruptor.
Parts 42 and 43, respectively, in this schematic:

https://www.gunpartscorp.com/gun-manufacturer/mossberg/shotguns-mossberg/500-moss/parts-list-mos-500

The cutouts are near the rear of the travel cycle (at the front of the bars ) , and if the pump is not run back fully, it will cause the shell not releasing as you have experienced. If the stop or interruptor, both of which are springs, are bent either in or out, this can cause it also.

The shells not ejecting is a separate issue; steels based shells which the Fiocchis mentioned are, as well as all others except Remington STS and Nitro 27 or Nitro Clays, and Winchester AA's (those are brass based) can 'hang up' some guns due to several facotrs. The first is steel does not contract as fast or as well as brass after firing. Your chamber could have been dirty or over oiled. (when I oiled the bores on my shotguns, I run a lightly soaked patch down the borethen run a dry patch after it. This is enough.) The third is your extractor could be malfunctioning, but that seems unlikely with the low round count you have through it.

There are numerous You Tube videos on reparirs and adjustments on the Maverick 88/Mossberg 500; I'd take a look at those, as well as the schematic I linked.
 
I took the gun to the gunsmith who was recommended. He looked it over and said the maverick seems to be working great. He said it looks cleaner than most guns he has seen, when i asked if my superficial newbie cleaning of it may have messed it up. .

It seems likely the malfunctions were a combination of maybe less than optimum shotgun ammunition and my own not racking it firmly enough all the way back and forward when cycling rounds.

When I shot it again today at range, aside from a couple brief times it didnt cycle fully and i just had to rack it again more firmly, it shot well.
 
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I had a similar issue with my mossberg 500 when it was fairly new. It would gum up and jam about every 100-150 rounds in the beginning. I would get fired shells stuck in the chamber, and have to rack it with quite a bit of gusto. I would take it down, pull the bolt and clean everything up, and it would run great again, for about 100-150 rounds and start acting up again. So, I started cleaning it, and putting it back together without oil. Either I was using too much oil and it was creating a gooey paste with the burnt powder residue or she just needed to wear in. In any event, that 500 runs great now. I do give everything a light touch of lube now, but it will go 300-400 rounds with no problems.
 
I recall mentioning to work the action vigorously when you got the gun. You started to get familiar with the gun, and lost the vigilance in working it fast and hard , both forward and back. You subconciously started to 'cut the corners'. It happens, and such malfunctions are a warning to get back to working the action vigorously. Like bersaguy says 'rack it with quite a bit of gusto'

I avoid the shells sticking in the chamber by using brass based shells. Winchester AA's, Remington STS, and Remington Nitro 27 and Nitro Clays are the only brass based shells still made. Remington Gun Clubs are the least likely of the steel based hulls to stick.
 
When my 500 was first acting up, there was a old timer at the clays course that helped me out when I got a spent shell stuck in the chamber. He took it by the forend in one hand, and pressing the bolt release button with the other and brought the butt down on a bench with an authoritative thud, she popped right open. He handed back my shotgun and said something to the effect of, "You just gotta treat 'er like the pig it is".... some 12-13 years later, that still makes me chuckle
 
When my 500 was first acting up, there was a old timer at the clays course that helped me out when I got a spent shell stuck in the chamber. He took it by the forend in one hand, and pressing the bolt release button with the other and brought the butt down on a bench with an authoritative thud, she popped right open. He handed back my shotgun and said something to the effect of, "You just gotta treat 'er like the pig it is".... some 12-13 years later, that still makes me chuckle
And it is true - I own a 500 for HD and the old saying to "rack it with authority" is true
 
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