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SKS Doubling Question

Discussion in 'Gunsmithing and Repairs' started by oldmodel70, Aug 13, 2013.

  1. oldmodel70

    oldmodel70 Member

    hi. I have a Norinco SKS i got in about 1992. I had the trigger pull lightened a little and shot it w/o incident for a few years. Didn't shoot it for a while but when i did i got two rounds with one trigger pull a few times.

    ALSO, and even more disturbing, the firing pin can be heard going forward when you open and close the bolt. This could cause a round to fire as it being chambered i believe.

    Did order a new firing pin - the one like the Russians SKSs had - which includes a spring- as i read that this kind of pin can help prevent doubling.

    My question is: what other parts should i try to replace to prevent doubling?
    To address the firing pin going forward issue?

    I know that whatever parts were altered to reduce the trigger pull weight should be replaced but what others? Thanks for any advice.
  2. HexHead

    HexHead Well-Known Member

    Only very early Russian SKSs had the spring loaded firing pin. 4Q1949-1Q1950. They were discontinued in the second quarter of 1950.
  3. dprice3844444

    dprice3844444 member

  4. Slamfire

    Slamfire Well-Known Member

    Yes it will given a sensitive enough primer. You can buy primers that are less sensitive, on the average, and these are mil spec primers, but because primers vary by sensitivity within the lot, there is always the risk of a slamfire even with mil spec primers. It is just there is a much higher risk of slamfires with thin skinned, composition sensitive, commercial primers.

    It is best to use in those Chinese or Russian SKS's CCI #34's or Tula 7.62 primers, which are "mil spec primers".

    Something else to practice, never drop a round in the chamber and drop the bolt on it. Always feed from the magazine. That little extra friction, which slows the bolt down, from stripping a round from the chamber makes a huge difference in slamfire frequency.
  5. Jim K

    Jim K Well-Known Member

    " I had the trigger pull lightened a little..."

    And whoever did it didn't do it right and left the parts soft so they wore after a few shots and faster than you can say "bang-bang", you have an "SKS Doubling".

  6. 4v50 Gary

    4v50 Gary Moderator Staff Member

    New parts needed.
  7. oldmodel70

    oldmodel70 Member


    The replies are extremely helpful. Best bet may be to contact the Little Armory guy for a workup on my trigger group. That sks may not be just hanging out in the closet for much longer.
  8. boom boom

    boom boom Well-Known Member

    Murray's Gunshop sells a retrofit spring loaded firing pin that duplicates the earlier Russian SKS pin. See murraysgunshop.com. I have one in a later Russian Model SKS and it functions perfectly. Does not alter your rifle and you can reinsert the original firing pin at any time. Murray also has a letter from ATF that indicates no problems with 922 requirements.

    I prefer to keep one kind of primer rather than a bunch of mil-spec primers that won't work right in other rifles that I have. I also do not want a rifle to double when I fire it. Murray's firing pin has helped me with that. Has not affected reliability with std. hard primer Wolf type ammo either.
  9. lathedog

    lathedog Well-Known Member

    Check your rebound hammer. If the little legs are too short they cannot push the trigger bar out of contact with the sear. Be super careful as, if the rebound hammer is the problem, the rifle will possibly fire when you chamber a round if you release the bolt with out riding it home (i.e. let it fly forward the way you are supposed to).

    I think on an SKS trigger assy, if the sear/hammer ledges are not holding, the rifle will "follow" not double. I might be wrong on that, but I do know that a bunch of SKS rifles imported by Navy Arms in the early 90's had bad rebound hammers.
  10. carbine85

    carbine85 Well-Known Member

    The OP never stated why it doubled.
    Did the hammer release? If so it's in your trigger group.
    Did it slam fire without the hammer dropping? If so it's in your bolt assembly. I would pin down the problem before you go and buy parts you don't need.
  11. 1hobie

    1hobie Well-Known Member

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