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Mosin Nagant Bolt

nilgaihunter
I recently purchased 2 of these for backup/spare parts. Neither one will close in my Finnish M91. I took them (along with my rifle) to a gunsmith and he told me the bolt face ring needs slight machining for bolt to close properly. My concern also is proper headspace with the "trimming of the bolt ring". Can anyone tell me if this is correct or not?

In addition, I disassembled the bolts to check firing pin length and cannot adjust either one of them any more and they are still too long according to the tool I have for checking for proper length. Can anyone tell me what I can do to remedy this if possible?

Thanks in advance
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4 comments

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  • nilgaihunter
    Greetings!

    I have searched and found nothing. Sorry if this is a classic FNG question ... but ... I recently purchased a Mosin Nagant made in 1930. I cleaned it up before firing it.

    Now I notice that IF I PULL THE TRIGGER then pull the bolt back, it is difficult to pull back! That as compared to simply cycling the bolt back and forth WITHOUT a dry fire or pull of trigger, it goes smooth.

    Did I manage to screw something up when I reassembled my bolt? Do I have an issue for a Gun Smith?

    Curious and clueless here,

    Ralph
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  • ammo guy
    I think the gun smith is right on removing a small amount of metal fron the outside of the bolt face. These guns were made by many factories and some variations do exist in the spec's for these factories. The 7.62x54R rd head spaces on the rim so it should not be a major problem to gradually remove metal until the bolt closes. As to the firing pin, these are designed to be moved in and out by means of a screw driver from the rear of the cocking piece, The end at that location ideally should be flush with the back of the cocking piece. However there can be either a protusion or a set in to the cocking piece depending on the wear of the firing pin. You should to take the tension off the firing pin spring to make the adjustments.
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  • rufe-snow
    I had the same problem with a Hungarian Model 44 with a mismatched Soviet bolt awhile back. The actual cause was that the extractor clearance groove machined in the base of the Hungarian barrel wasn't deep enough. There was a mismatch between the protrusion of the Soviet extractor and the depth of extractor groove in the Hungarian made barrel.

    Between swapping different bolts and extractors and shimming the extractor I got it to work.

    Try removing the extractor and checking if the bolt will close, before machining anything.

    I believe although the basic Mosin Nagant design used by the Russians since the early 1890's, that was copied by the various East Block countries and Finland were similar, their was enough variation that some of the parts aren't completely interchangeable.
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  • drobs
    I know nothing of working on these rifles. However, I'd recommend some go/no-go head spacing gauges.

    While working part time at the gun shop range we had an eastern european hurt himself pretty good by switching his Nagant bolts on our range. He didn't tell us what he was doing till after bloodying himself. Said he was trying to find a bolt that would headspace on his rifle via live fire.
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