Mosin Bolt Woes

M

Mosin-Marauder

New member
I got a new extractor in the mail today trying to remedy this problem, but to no avail. It still takes considerable force to chamber a round sometimes and it's generally not very smooth. When I clip a round in the bolt face and try to chamber it it chambers like a dream, this is how I've determined it's an issue with the extractor. But when I strip it from the magazine or manually put it in the chamber, it is a pain. I think it may be the extractor. I did some (SOME) polishing with 100 grit sandpaper but it doesn't seem to have helped much. Here are some pictures.



Any advice? I know pin protrusion is good.
 
Sorry that I can't help. And the only advice I would give would be NOT helpful, and nobody wants to hear it. :p

But in reading the problem, it seems obvious that you left something out that might help potential "fixers." You've been running this rifle for a good bit already, haven't you?

Is this a new problem?
What lead up to it?
What do you think you know or can describe when it used to work and when it made the transition to NOT working?
 
100 grit is coarse for polishing. Try some 220 then 400. You should not see the swirl or scratch marks after polishing.

Check to see if the bolt face is allowing the cartridge head to slide into place or if it is dragging and causing a bind. Check for smooth transition of the cartridge from magazine to chamber. Color a cartridge with a black magic marker or sharpie. That will cause a scratch to show easily, thereby showing the location of any burrs or rough spots.
 
Mo, I think you need to take a fired cartridge, manually place it in the bolt and then chamber the cartridge and see how the bolt closes. If the bolt closes easily with a fired cartridge and it won't chamber a loaded round easily, I would suspect there is a problem with you resizing process, possible head space problem. Something to that affects the rim and head.
 
But when I strip it from the magazine or manually put it in the chamber, it is a pain. But when I strip it from the magazine or manually put it in the chamber, it is a pain. I think it may be the extractor.
Click to expand...

As I explained in your prior thread, the action is push-feed, not controlled feed like the Mauser. The extractor does not engage the rim/round until you close the bolt- so it would have nothing to do with stripping it from the mag- unless you've got some kind of misalignment going on where the boltface just isn't engaging the round correctly.

When you had the extractor removed, could have chambered a round sans extractor and see if there was any difference in resistance to closing the bolt. I'm wondering if somehow the extractor groove could be cut/timed incorrectly, but it looks "right" in the picture you posted previously.

Feeding/chambering rounds with/without the extractor in place is a simple way of determining if it is involved with or causing the problem.
 
It is smooth with out the extractor because the extractor dose not have to go over the rim of the case to grab on to it. That is how push feeds work, the extractor is pushed over the rim of the case causing resistance. This is normal and it is how the action works.
 
Cycle the bolt without the extractor a few times watching the cartridges closely. Put the extractor back on and watch the cartridge again looking for differences. It should show what is causing the binding.
 
Im fairly certain it is because there were burrs on the extractor, I have some 400 grit sandpaper, any tips on where to polish? I've already polished the face.
 
I used a mild abrasive edge on a dremel, as the sandpaper wasn't cutting it. It worked. It's not super smooth, but I don't have to slam the bolt closed anymore. I might polish up on it in the future. Thanks for all your help guys.
 
Just curious, but how do you normally operate the bolt?

Do you do it "softly" and slowly, or "smartly", and with force, in both directions?

The later is the proper method, by the way, and especially with the military guns.
 
them russian girls like a little force when your handling them, dont be "gentle" ^ as above says, quick force makes its work
 
I normally give it a little Persuasion. I'm not slamming it by any means, but I'm not pussyfooting around either. I used to have to SLAM it every now and again but now I just need to apply normal force.
 
If you mail me the extractor I will fix it for you free.
I have done several for other shooters. I can mail it back to you polished like a mirror.
 
I strongly suspect the "Claw" section of the extractor is bent down too far to ride over the rim of the case. Not an uncommon condition with extractors of that type. The extractor cut in the barrel is mainly clearance for closing the bolt when the chamber is empty. Super glue a piece of shim stock on the flat of the bolt where the extractor is held away from the bolt face. It is quite small, but can be done if you have good hands yet. If it works out, you can solder the shim there.
 
As I said, the issue has been fixed. It was just a matter of that the extractor face was rounded for some reason and it wasnt sliding over the rim properly. All is well now and the action cycles fine.
 
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