Mossberg 183 410 FTE

[HuskyDude]

I have a 183KB that will sometimes not eject the spent shell.
Everything is clean and working, as far as I can see .
The spent cartridge head OD is .4785.
I don't have a new shell to measure.
The extractor looks good and has a sharp edge
But on a FTE seem to skip over the shell's rim.
Thinking if the OD of the spent shell is within acceptable limits...maybe the extractor spring ?!?

Any help would be appreciated.

 

[Lodi]

I wouldn't worry too much about the rim OD, things should work with the given tolerances.

~There are two extractors, make sure they are both clean and have no burrs. A pass or two with a stone will both reveal burrs and remove them.

~ Make sure the holes in the extractor, for the extractor pins, have no burrs.

~Clean the extractor slots in the bolt body and remove any burrs.

~~When assembled, the extractors should pivot smoothly.

~Make sure the ejector is firmly secured.

~Clean the chamber, be sure to remove any rust and crud.

Try to determine if the malfunction occurs before or after the shell contacts the ejector.

Stronger extractor springs may be required, but are not a solution for other issues.

 

[highlander]

Try different ammo.

On some the rim is more rounded.

 

[Archer Sam]

Make sure the extractor/ejector springs are giving enough pressure to engage the shell and hold it firmly. Old springs can get weak. A piece of lead shot the same size as spring hole under the spring will help if you can't find new springs.

 

[gunrunner100]

Try different ammo.

On some the rim is more rounded.

This^^^^

~Clean the chamber, be sure to remove any rust and crud.

And this^^^

 

[HuskyDude]

I haven't had a chance to try different ammo yet.
The chamber was thoroughly cleaned and polished before posting.
I also dismantled the bolt and gave all parts a good cleaning in the ultra sound cleaner.
When I had the 'right' extractor out I did reface it to have a nice sharp edge again.
Didn't really look for another spring, but did carefully expand the old one just a bit.
Daughter bought some more Challenger Ammo and everything seems to work.
If it acts up again I will change the extractor spring.

Far as I can tell the left extractor isn't really an extractor, more of a control to keep the shell held in place and to help the right extractor do its job.
No idea how to remove it or if it can be removed.

 

[Lodi]

But on a FTE seem to skip over the shell's rim.

Far as I can tell the left extractor isn't really an extractor, more of a control to keep the shell held in place and to help the right extractor do its job.

Yes, that left extractor really is an extractor. Yes, is does control the shell to help the right extractor do it's job.

If the left extractor is faulty then maybe it can't control the shell and maybe the right extractor fails in it's job.

~~~

The left extractor will have a 'smooth bump' rather than the sharp hook of the right extractor.

When the bolt is retracted the shell is pulled rearward. When the shell's left rim contacts the ejector it stops moving rearward. As the bolt continues it's rearward movement the right extractor is still pulling the right-hand side of the shell towards the rear. As the shell pivots for ejection the rim under the left extractor is able to overcome the tension of the extractor spring and slide over the 'smooth bump', allowing complete ejection.

For extraction/ejection to work the left extractor must be smooth and the right extractor must be sharp.

The right extractor must control the shell so that the left extractor can do it's job.