[How-To] Checking the firing pin protrusion on a Mosin Nagant 91/30 rifle

Discussion in 'Gunsmithing Forum' started by molonlabexx, Jul 17, 2014.

  1. molonlabexx

    molonlabexx New Member

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    I cannot stress the importance of this for ANY firearm. If your pin is striking a primer too deep, it can really cause a lot of issues and can be catastrophic depending on how bad it is. Because a lot of people miss what the "Mosin tool" is for, I wanted to make a video about it. Enjoy and let me know if you need help, I don't want ya'lls pretty faces getting hit with gas!

    [ame]https://www.youtube.com/watch?v=ur85IJg0IJA[/ame]

    [ame]https://www.youtube.com/watch?v=LPA_D26ezcc&feature=youtu.be[/ame]
     
    Last edited: Aug 10, 2014
  2. dteed4094

    dteed4094 New Member

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    I think this should be a sticky. A while back there was a person new to guns that thought it wouldn't hurt to just try his Mosin out without checking the pin protrusion as he didn't get the tool with the gun and couldn't afford the couple dollars to buy one. Hopefully we convinced him to wait. I myself didn't know squat about Mosins when I bought mine and straight from the LGS to the range. I did have penetration 2 out of the first three rounds I shot. Fortunately I noticed and took the gun home and spent the next 4 hours researching all I could about the gun. Problem rectified. Many lessons learned.
     

  3. therewolf

    therewolf New Member

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    ^^^^^^^^^^^^^^^^^^^^^^

    Yeah, that whole "firing the gun without cleaning it first".

    That will work with Remingtons, Marlins, Rugers and most

    other American firearms, but not comblocs.


    If you don't field strip, clean, and oil your AK,SKS, Mosin, or

    other combloc milsurp, you'll be lucky if you have the mother of

    all jams before you fire it, heat up the cosmo, and allow

    it to melt and stick to the cartridge in the chamber.
     
  4. JonM

    JonM Moderator

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    add in a portion on the vid how to adjust the protrusion itself and i will sticky this thread.
     
  5. molonlabexx

    molonlabexx New Member

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    I can do a separate video in the next few days. Will that work for you? I can just edit it in in the OP for a total of 2 videos.
     
  6. JonM

    JonM Moderator

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    that will be fine. if your editing priviliges expire before your ready just pm the link to the vid and i will add it in.
     
  7. molonlabexx

    molonlabexx New Member

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    Alright thanks bud!
     
  8. molonlabexx

    molonlabexx New Member

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    Update: Sorry for the video delay, I HAVE NOT forgotten about it, just been SUPER busy. I plan to do the video on how to fix protrusion on the firing pin here in the next few days. Looking forward to helping the community out and thanks for the opportunity!
     
  9. Chainfire

    Chainfire Well-Known Member Supporter

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    While you are in the videographing mood, show 'em how to check headspace, stressing the importance of that, especially if the bolt is not a serial match to the receiver.
     
  10. molonlabexx

    molonlabexx New Member

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    In my personal recommendation, head spacing is something that should be checked by a professional. I have seen to many "go" bolts that end up being a disaster. That is just MY opinion and certainly not the case for everyone. We just have a lot of kitchen gunsmiths.
     
  11. Chainfire

    Chainfire Well-Known Member Supporter

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    You have seen multiple disasters related to bad Mosin-Nagant bolts/head-space?

    I have never heard of any serious problem with a Mosin except for a cracked receiver on one gun that made the internet rounds about two years ago. Most of the rifles are arsenal refurbished and are in dang good shape, from a safety point of view.

    Mismatched bolts, however could certainly have an issue, and it takes a set of good head-space gauges to determine if there is a problem; they are simple to use and do not require the services of a gunsmith.

    If you only own one or two rifles and you are concerned for safety, certainly take them to a smith, and hope he has the proper gauges. I own nearly four cases of the rifles and I have head-space checked all of them. I am not going to take each one to smith. So far, I have not found an improperly head-spaced rifle, and I have shot all of them without issue.
     
  12. Chainfire

    Chainfire Well-Known Member Supporter

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    You have seen multiple disasters related to bad Mosin-Nagant bolts/head-space?

    I have never heard of any serious problem with a Mosin except for a cracked receiver on one gun that made the internet rounds about two years ago. Most of the rifles are arsenal refurbished and are in dang good shape, from a safety point of view.

    Mismatched bolts, however could certainly have an issue, and it takes a set of good head-space gauges to determine if there is a problem; they are simple to use and do not require the services of a gunsmith.

    If you only own one or two rifles and you are concerned for safety, certainly take them to a smith, and hope he has the proper gauges. I own nearly four cases of the rifles and I have head-space checked all of them. I am not going to take each one to smith. So far, I have not found an improperly head-spaced rifle, and I have shot all of them without issue.
     
  13. molonlabexx

    molonlabexx New Member

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    Let me re-phrase, for people that just bought their first rifle and think they can just order a kit and call a rifle safe to shoot is not a good thing, and that is my opinion and mine only. Someone, such as you, that knows the rifle inside and out and can probably use a gauge the proper and educated way is certainly good and can make the actual decision if the rifle is ok to fire or needs a smith to work on it. If one of my customers bought a surplus rifle, I would be more than glad to do a FREE check over it. I'm not saying the thing is a pipe bomb if it has some bad spots, but anything can happen and gas blowback can be serious depending on how bad the spacing is. Someone that is not wearing eye protection could experience serious repercussions.
     
  14. Mercator

    Mercator Active Member

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    The track record of surplus Mosins (ex Soviet anyway) is good. Most people don't bother with the gauges. If those rifles had a habit of starting a new life in America with a kaboom, because of a firing pin protrusion or a loose headspace, it would have been all over the Internet. Not the case.

    That said, we all know what we are supposed to do with any used, especially surplus firearm. Take it to a gunsmith. Everyone does so? Right. It's a personal choice based on personal judgement of the firearm and of your own abilities.
     
  15. molonlabexx

    molonlabexx New Member

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    Alright! Here is the video, sorry for the delay! I have also added it to the OP. Thanks for the opportunity.

    [ame]https://www.youtube.com/watch?v=LPA_D26ezcc&feature=youtu.be[/ame]
     
  16. Highpower

    Highpower New Member

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    Good video. The only thing i didn't see mentioned was that the firing pin has to be turned to one of two positions on re-assembly because of the flats on the firing pin and inside the hole of the bolt connector & guide bar, that are 180° apart. They are somewhat "keyed" together. You can't really "fine tune" the firing pin with a 30° turn for example. The bolt won't go back together without turning the firing pin back to align the guide bar with the lug on the bolt body. So you end up right back where you started. Adjustments are essentially 1/2 turn only. You just have to live with the firing pin protrusion within a half-turn one way or the other, unless you want to replace parts. Good enough for government work as they say.
     
    Last edited: Aug 10, 2014
  17. molonlabexx

    molonlabexx New Member

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    Good points. As you said though and as I stated, it doesn't have to be dead on the money, just within the spacing.