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Mosin Bolt Jam

Discussion in 'Rifle Country' started by sarge83, Nov 12, 2012.

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  1. sarge83

    sarge83 Member

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    My brother purchased two 1943 Mosin's and is having issues with both of them. When he fires the bolt will freeze and has to be pushed up with great force on one to eject the shell casing.

    On the other rifle even if you can get the bolt up and back sometimes the empty casing has to be pushed out with a cleaning rod from the breech.

    He has taken them both down from the wood, disassembled the bolts and cleaned them scrubbed and cleaned the barrels with butches bore shine and a brass brush and still the hanging bolt. Any suggestions?
     
  2. greenlion

    greenlion Member

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    Clean more. Watch a few of the video tutorials on Youtube for Mosin "sticky bolt" syndrome. Its not uncommon.
     
  3. dogrunner

    dogrunner Member

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    Like the man said, clean it more............MN are notorious for having gummed up chambers........cleaning the bore doesn't do much if that chamber is coated with old crapped up lacquer left there by a lotta surplus lacquered rounds.

    I'd suggest a good solvent soak and then followup with a good bronze shotshell brush chucked in a hand drill and ran at fairly low speeds......just be careful you don't let any of the steel center contact the chamber or bore.

    My bet would be that those shells that have to be punched out are doing that because the extractor is overriding the rim............brings the question of pitting in that chamber but you gotta clean it before you'll be able to make that call.
     
  4. tyeo098

    tyeo098 Member

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    Take apart the bolt.
    Boil it in water for 15 mins
    Lube
    Reassemble

    You have cosmo in your bolt from a crappy cleaning job.
     
  5. Fred_G

    Fred_G Member

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    As the others said, take the bolt apart, clean it, and clean the chamber. What ammo are you using? You might also try different ammo if you are shooting surplus. I have one box that makes the bolts on 3 different Mosins very hard to work. In all 3 guns, switching to another batch of ammo and the bolts worked great.
     
  6. Bigdog57

    Bigdog57 Member

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    Avoid the 'green' laquered ammo. Always gave me trouble. I have five Mosin rifles - the 'copper-washed' and brass cased ammo has no such issues.
    Also, wartime Mosins had roughly finished chambers - I have found polishing the chamber with a shotgun cleaning mop and fine polishing compound really helps. Don't remove any metal, just a good polishing/burnishing.
    It's the roughness of the chamber that often holds the laquer as it softens from firing.
     
  7. Cosmoline

    Cosmoline Member

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    Also remember not to open it with your fingers. Use your arm and slap it up with the palm of your hand.
     
  8. TurtlePhish

    TurtlePhish Member

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    Look in the bolt lug recesses for cosmoline, too. It can get there and cause serious sticking. The failure to extract could be caused by gunk underneath the extractor. Knock it out of the bolt head with a punch and clean underneath it, then reinstall it.

    Cosmoline dissolves quickly in mineral spirits.
     
  9. Clipper

    Clipper Member

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    I don't shoot milsurp in mine, it's either commercial SP or handloads, but I'd do the 20 ga brush/drill routine with laquer thinner...That stuff will disolve just about anything.
     
  10. caribou

    caribou Member

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    Cllean the chamber of cosmoline.

    It can look bright and shiney, especcially if you have fired rounds.

    A 20 gauge brush and some break cleaner will take the chamber cosmo out and down to steel.

    Sticky/hard to open bolts are the Mosin's way of telling you to clean it. The cosmo protected it through 60 years of storage and can be hard and dry, gotta dissolve it.
     
  11. Rail Driver

    Rail Driver Member

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    I agree with everyone else - clean more. You're not there yet.
     
  12. kingcheese

    kingcheese Member

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    I soak my chambers with clp once ever 100 or so rounds, you'd be surprised how dirty a "clean" rifle can really be
     
  13. brnmw

    brnmw Member

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    Cosmoline... Clean Well...Agreed.
    It is very typical.
     
  14. sarge83

    sarge83 Member

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    Thanks will pass on the info.
     
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