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Chinese sks jamming

Discussion in 'Gunsmithing and Repairs' started by huevos91085, Nov 3, 2008.

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  1. huevos91085

    huevos91085 Member

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    I'm new to this forum but I need some help with my sks. I'm aware that jamming is fairly common among the sks'. I do not have any issues with the spent round getting stuck in the chamber, I just have a problem with the bolt sliding the round INTO the chamber. The tip of the bullet jams right below the barrel so I have to pull the bolt back and stick something slim like a key or knife under the bullet to angle it up into the chamber. It does it usually every 2 to 3 shots and sometimes when I manually cock it after loading the mag. I'm puzzled as to what to do to fix this. I have thoroughly cleaned everything including the gas chamber and i've gotta figure out how to fix this Thanks for the help.
     
  2. rcmodel

    rcmodel Member in memoriam

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    Standard fixed 10 round mag?

    Or 30-round duck-bill mag.

    If the later,
    that right there is your problem.
     
  3. rcmodel

    rcmodel Member in memoriam

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    What video?
    No, I guess I haven't watched it.

    However, I can't recall ever seeing a Chinese SKS that wouldn't feed perfectly with the 10-shot standard fixed mag they came with.

    But I can't begin to count the 30-round duck-bills I have seen over the years that simply didn't work without extensive tinkering!

    And even then, they were sometimes marginal compared to the original mag that came on the rifle.
     
  4. rbernie
    • Contributing Member

    rbernie Member

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    Jamming is NOT common for stock SKSs. In fact, SKSs are known to run like the proverbial swiss watch when mechanically left alone and fed standard FMJ ammo.

    If your ammo is getting stuck below the chamber, something is preventing the nose of the round from angling up as it is supposed to do. This is almost always due to a bad mag, be it a stock fixed 10rd mag or an aftermarket mag.

    What ammo are you using?

    How do we know this? The OP doesn't say.
     
    Last edited: Nov 4, 2008
  5. Mac's

    Mac's Member

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    SKS's are not known for jamming, even when abused or not cleaned. The biggest problem that i've seen with them over the years, is with mag swaps.

    It sounds like your's needs to have the feed lips on the mags trimmed back a tiny amount. If the nose of the round is running into the frame under the chamber opening, the front of the round needs to be allowed to lift a little more. Use a grinding stone (Dremel, etc), keep the lips the same same shape as they are now and just make them shorter...front to rear. Grind off a tiny amount on both lips and then try it. Go slow. It's easier to remove some more metal than it is to put it back.

    A second possibilty is that the chamber has varnish in it. Some types of 7.62 x 39 ammo is "painted" with varnish. If the chamber gets real hot, the varnish can melt onto the chamber walls. That'll make chambering and extraction difficult. That varnish will not come out with a normal cleaning.

    If you stick with the original ten round fixed mag, it'll run forever. My first choice is one of the Red Star 20 round fixed mags. With a little tuning on the feed lips, those will run forever too. I have those on all of my SKS's and they're as reliable as the original ten rounder's...just with double the capacity. It looks and mounts the same as the original ten rounder....it's just a little deeper.

    I tried one of the extended detachable mags and ended up throwing it in the garbage can at the range. Pure junk! If I want to use a detachable mag, I'll use one of my other rifles. Keep yer powder dry, Mac.
    Tuff-Gun Finishes. The Name Says It All.
    Mac's Shootin' Irons
    http://www.shootiniron.com
     
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