Survivalist Forum banner

1 - 20 of 22 Posts

·
Registered
Joined
·
2,325 Posts
Discussion Starter #1
I’ve got a Mosaberg 500a I acquired used of unknown age and prior use. Was recently shooting it and after about 20 rounds in a short time (2-3 minutes) it jammed - could not open the bolt. After about 5 minutes of fiddling with it, it seems like it finally unlocked and I was able to rack it and then ran another 5 rounds through it without incident.

I haven’t looked at it since. Any ideas what might cause that, what I should look for?
 

·
Semper Fi
Joined
·
8,916 Posts
OP had you lubed the gun before shooting it?

I don't think it's applicable to a Mossberg but I have had issues out of the box with the bolt not unlocking on my Win 1300 due to brass being too thick on the rim. This is due to the rotating bolt not having enough clearance. Winchester fixed it and sent it back and I have had no issues since.
 

·
Registered
Joined
·
2,325 Posts
Discussion Starter #7
I was using relatively new, production Winchester ammo at the time. Before that had fed it Remington, Estate, and some reloads with no issues. Did not lube it recently. I was thinking maybe it was getting hot and seized, and when it cooled enough it un-seized. 🤔. I dunno - never had that happen to me before.

I’ll clean and lube and try another box of ammo through it on a hot day - see if it suffers reoccurrence.
 

·
Registered
Joined
·
135 Posts
Likely the brand of ammo. My Remington 870 will jam up with some of the cheaper stuff. I'd also do a full disassembly and thoroughly clean, lube and inspect all parts for anything like a burr that could cause a hangup. At the end of the day, modern inexpensive pump actions are capable of malfunctions and some are prone to them.
 

·
Semper Fi
Joined
·
8,916 Posts
Likely the brand of ammo. My Remington 870 will jam up with some of the cheaper stuff. I'd also do a full disassembly and thoroughly clean, lube and inspect all parts for anything like a burr that could cause a hangup. At the end of the day, modern inexpensive pump actions are capable of malfunctions and some are prone to them.
Rem Express?

Replace the extractor with one from a Wingmaster and polish the chamber.
 

·
Registered
Joined
·
2,325 Posts
Discussion Starter #14
I only have 2 pumps but this is the only time I have had a pump jam and never saw any others jam ie friends using them.
 
Joined
·
871 Posts
You might also want to lube your locking lugs and extractor assembly.

I’ve never had issues with any ammo in my 88z
 

·
KOAD; FOAD; ESAD
Joined
·
7,088 Posts
I have a 500 and a 590...also a Youth 870 20 ga..never a prob w any of them...Most likely issue is ammo followed by crud..jmo
 

·
Registered
Joined
·
398 Posts
I've had two problems with Mossberg 500 series shotguns.

One involved not having the nut on the end of the magazine tube screwed down far enough.

The other was more involved. The Mossberg trigger/hammer group is housed in plastic. After hard use, the
trigger/hammer group gets loose in the receiver. You can see it if your look for it, the greatest point of looseness is in front of the assembly where there is a plastic lip that should be held up firmly by the metal receiver. If the plastic is worn or otherwise damaged, the trigger/hammer assembly can drop down far enough to cause missfires. Best answer: new assembly.
DIY answer: cut a groove in front of the plastic assembly and force in a flat bar of steel that will bridge the space between both sides of the receiver and support the old assembly.
 

·
NRA Life 1971
Joined
·
8,422 Posts
I keep spare trigger assys for the Mossbergs because they are plastic but I have not had to use any so far. That is the only plastic part on the older ones I own.
 
1 - 20 of 22 Posts
Top