SKS trigger system problem

Junckopolo

Junckopolo

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Situation:

I shot it last summer 2019. No problems at all at that point. Only change I did was adding a magwedge kwikrail since then.

Today I went to shoot and couldn't get a shot out of it, pulling trigger did nothing. Cleaned the bolt but that was not the problem.

So after inspecting and trying things, I realized the problem is that the hammer won't be released because the bolt follower is not pushed down enough to allow its release. You can see that here where after pushing everything down, it will release the hammer (Results are exactly the same when completely assembled. Just showing the details here.)

https://imgur.com/dqBkLxO

So here is the part that need to be pushed down more. I can manually push it down and release the hammer, so seems like the bolt is not pushing it down enough when it is closed. Even fully assembled, the (Edit) bolt carrier had somewhat of half a mm of wiggle room. Has any of you guys had a problem like this and can help me?

EJikJba.jpg


21L8rhZ.jpg
 
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I think something is holding the bolt open. Push ahead on the bolt handle. Maybe even give it a wack.

When the bolt drops down and locks in place it pushes that rod.

If the rod isnt being pushing id bet the bolt isnt closing all the way. It may take a little force to get it ahead. If you can just haul the bolt back and let it go. It should slide into place.

Maybe your rail is holding the bolt or the carrier open a bit.. Or the extractor is seized up and not jumping the rim
 
Evanguy said:
I think something is holding the bolt open. Push ahead on the bolt handle. Maybe even give it a wack.

When the bolt drops down and locks in place it pushes that rod.

If the rod isnt being pushing id bet the bolt isnt closing all the way. It may take a little force to get it ahead. If you can just haul the bolt back and let it go. It should slide into place.

Maybe your rail is holding the bolt or the carrier open a bit.. Or the extractor is seized up and not jumping the rim
Click to expand...

I made a small mistake, the bolt carrier seems to have a very small wiggle room that when pushed down, it does release the hammer. I have no problem when I pull and release the bolt carrier, all sounds like it goes into place. Slides all good. It just need a small pressure down to be able to fully release hammer.

After opening, cleaning and oiling, it still has the problem.

The rail doesn't seem to be affecting the bolt carrier in any way when looking or operating it.

Small edit: tried again closing the bolt carrier and pushing ahead. The only way I can get the hammer to go when fully assembled is to push down the bold carrier. Bolt carrier closes completely.
 
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What if you take it apart like in the pic above..and only put the bolt in and make sure it is full lock up as if its ready to fire then try dry firing it. It should work, if it does id bet the issue is in the carrier or bolt it self. Post pics of both and the little ramps on the carrier and bolt that cam the bolt in place
 
Remove the kwikrail and replace the original cover takedown pin.

From your imgur video it looks like the fit of the cover with the aftermarket magwedge pin might be the problem.
 
Boris Badinov said:
With an empty chamber of course.
Click to expand...

Been doing that, of course.

Evanguy said:
What if you take it apart like in the pic above..and only put the bolt in and make sure it is full lock up as if its ready to fire then try dry firing it. It should work, if it does id bet the issue is in the carrier or bolt it self. Post pics of both and the little ramps on the carrier and bolt that cam the bolt in place
Click to expand...

I trying dry firing it with just the bolt. I know it works if I push on it. I feel the issue is the carrier, the bolt doesn't look too tired out.

Boris Badinov said:
Remove the kwikrail and replace the original cover takedown pin.

From your imgur video it looks like the fit of the cover with the aftermarket magwedge pin might be the problem.
Click to expand...

I removed it and put the older pin. I had the same problem for a while. The receiver cover is as tight as with the kwikrail.

But after playing with it trying to see how the bolt was moving with it and trying your propositions, it stopped having problems. Even with kwikrail I have no more problems. I'll go to the range tomorrow morning and test it with the kwikrail on and off, I'll keep you guys updated.

As far as it goes for now, I'm back to the same gun config as it was this morning, but now the hammer is released when I pull. I guess I was not believing hard enough this morning.
 
Looks like a stackup of sloppiness is preventing the bolt carrier from fully pressing down the bolt in front of the square cross pin.
That square cross pin in the receiver is a hardened steel piece that takes the reaction load of the bolt upon firing, and the bolt MUST be firmly seated in front of it.
The rat tail is the sensor that determines that the bolt is in battery and deems it safe to fire.
Most probably, the slots in the carrier and the rails in the receiver are not snug enough to firmly press everything down.
Try to determine if there is enough engagement (before pressing down on the carrier as in the video) for the bolt to be safely constrained by the cross pin.
If safe, then weld on a bit of meat onto the end of the rat tail, and file back down until it's just .010" longer than before.
If not, then weld a pad onto the aft underside of the carrier and file down to about .010" more than before.
Don't think of doing any welding on the bolt itself, as its heat treatment is too critical.
 
Boris Badinov said:
A very similar problem was discussed and solved on gunboards.com AK/SKS sub-forum last summer:

https://www.gunboards.com/threads/i’ve-done-something-wrong-help-solved.1160005/unread
Click to expand...

Reading the thread, I think the problem was a dirty sear for me. While I did not take everything apart, I had somewhat cleaned the group with brake cleaner and oiled the thing. Using it while trying to get it to work probably finished oiling it and making it work properly. Will still test and come back tomorrow.

infidel29 said:
Silly question. Did you lose the spring that sits between the stock and trigger group? That might explain things.
Click to expand...

All is there and in place.
 
Small update. still couldn't shoot this morning, so I went to a local guy and he cleaned the bolt way better. However, it is still failing half the time to punch the primer hard enough.

I left the gun there, and will update with whatever he says he did that solved the problem.
 
Just a couple thoughts that haven't been addressed. 1- does the action have 'matching numbers' as much as possible ? 2- Did you buy this from a prior owner or a dealer ? Maybe unknown mods ? 3- Does the bolt face have a raised rim around the firing pin ? 4- You haven't said (tho suggested not) whether you 'really cleaned' the bolt and firing pin. The pic of the trigger group 'looks' still dirty (tho I'm sorta anal about cleaning) and may not affect the trigger release, it still questions how clean is clean. I only put a dab of synth grease on the sear rails and contact surface and a dab on the bolt rails. All else 'collects' c---.
 
Stock...stock? Or after market? Sounds like your trigger assemble is no going up in far enough. The finger usually doesn’t ware down that much.
Just watched you video.... if you look at the side window, on the trigger assembly there is a piece of metal the will slide forward and allow the hammer to fall, yours is getting caught .maybe ... hard to tell from the pics.
Cheers
Brian
 
I looked at the vid closely and it seems that maybe the Sear has been re-worked Too Much, causing that disconnector bar to not go down enough ?
 
Buck1950 said:
I looked at the vid closely and it seems that maybe the Sear has been re-worked Too Much, causing that disconnector bar to not go down enough ?
Click to expand...
Yep....where is bubba , if you have or have a friend that has another trigger Assembly , change it out and see if that makes a difference, I think it will. Changing the trigger assembly will do nothing to hear space or anything else, except maybe tell ya if ( your trigger group) has been a little over worked.
Cheaper way to find out .... just switch it out with another.
Cheers
 
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