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Discussion Starter · #1 ·
I went shooting with some people last week on a snow covered farm in the sticks. While my brother shot some hollow point rounds into a frozen lake, I guess a little pin must have rattled loose and the rifle jammed. See attached image to see exact location of the pin I took the rifle apart to remove the live round from the chamber, and then went home. I am still relatively new to the world of assault rifles, so I need a little bit of help from you guys to put my sexy machine gun back together.

Maybe some advice on how to go about repairing the rifle, and what you guys think may have gone wrong. Also a link to a manual or diagram of the engineering of an AK, preferably the Chinese Polytech...'91 model, I believe, would probably help a lot too.

Thanks guys.
 

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Formerly Known as GOFO
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If that rivet came loose I would not fire your rifle again until you get a new rivet pressed in there. That is your rear trunnion and the bolt does make occasional contact with it;. Over time this can happen. But you don't want to shoot and bust the 2nd rivet.
 

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What's circled in that pic is indeed a rear trunnion rivit. You can install another rivit, or tap teh trunnion and use a screw.
 

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Still Alive
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Discussion Starter · #6 ·
Thanks for the responses guys, at least now I know what I am working with.

So a couple of you have advised putting a new rivet in there, does that mean the old one that slid out is no longer usable?

Also, is this a repair a novice like me can handle, or is it a better idea to take it to a pro?

Thanks again.
 

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Formerly Known as GOFO
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Spook - what probably happened was the rivet broke in half from constant stress.

Usually the rivets are pressed in using a press. You 'can' hammer them with a mini-sledge and a proper rivet forming thingy (can't remember what they are called at the moment).

I wouldn't use a screw as the steel has to have a proper temper or it will sheer if it is too hard or get pulled out if it is too soft under the right conditions.

Since this is a Polytech AK which have considerable resale value I would really look into either finding an AK builder in your area or finding a smith that works on AK's in your area to do it for you so that you don't screw it up and hurt the value of this rifle.
 

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المتخلف&
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Very true, very true. Thank you for pointing out my error.

Just don't like that word group.
Meh, I could care less about it really, I just saw an oppurtunity to be a smart ass. I don't care if it's a bad word or not, because the anti gunners don't write my dictionary, and neither do grammar or history nazis.

I used to play the word game with anti-gunners, but explaining select fire, fully auto, semi-auto, etc does little to help any situation. They are very simple people, just carefully explain "noooo, guns = good, bad people = bad, guns in the hands of good people directly counters guns in the hands of bad people, for example, why don't you go screaming and debating cops carryying guns? Because it's assumed they're good, right? and they have to protect themselves from bad people, right? No amount of using scary words changes this for the average person"
 

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Anyone?
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After getting it repaired, you might want to think about installing a buffer.
Just a $10 piece of urethane that will keep your bolt from slamming directly against your trunion.
I have one from Blackjack buffers in my Romy. I wish I could give a full report but I only have a few hundred rounds with it in.
It definitely reduces that "whack" noise that AKs make, so I'm thinking it's doing something.

BTW, some folks report malfunctions with buffers, generally due to the thickness interfering with full cycle. BJ makes theirs fairly thin. So far so good for me.
 

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Layman
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It appears that a rivet came loose. which sucks. I would take it to a gun smith unless you know how to rivet it back.

+1 For H&C

I always found the term assault rifle misleading, because you can assault anyone with any rifle...
 

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May the Lord be with us
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If you do not have any experience with riveting, have an experienced professional with a press do it right. The cost will be peanuts. Having it done properly could save you from a catastrophic injury should a screw patch fail and steel goes flying.
 

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... --- ...
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After getting it repaired, you might want to think about installing a buffer.
Just a $10 piece of urethane that will keep your bolt from slamming directly against your trunion.
I have one from Blackjack buffers in my Romy. I wish I could give a full report but I only have a few hundred rounds with it in.
It definitely reduces that "whack" noise that AKs make, so I'm thinking it's doing something.

BTW, some folks report malfunctions with buffers, generally due to the thickness interfering with full cycle. BJ makes theirs fairly thin. So far so good for me.
I got a Lancaster-build several years ago that came with a buffer. I started researching them,especially on the AK forums, and in the AK section on arfcom, and the almost universal view is that these things are a bad idea.
Basically,the bolt does contact the rear, but adding a spacer shortens the distance, increasing the force of that contact, not "buffering" it.
Look at it like this: if I stand right at an arms length from you and punch you in the chest, my fist will barely contact you. But if you then hold a phone book against your chest and I take the same shot,you've then been effectively punched in the chest. See what I mean ?
Mikhail Kalashnikov didn't include a buffer in his design, and I don't know of any AK's coming out now that come with them.
 
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