Author Topic: Shells jamming in the chamber  (Read 3675 times)

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Andronicus

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Shells jamming in the chamber
« on: June 22, 2021, 11:54:38 AM »
I have a 1982 Chinese SKS that has started jamming shells in the chamber.  After firing, the spent shell is stuck in the chamber.  I thought it may be the new type of ammo I was using, but found some old shells I had fired previously, and they also are jamming.  In fact, when I put them in, they wont go all the way into the chamber, preventing the bolt from going into battery.  I have to let the bolt fall all the way from fully back to get it to go into battery.  Then the shell is jammed.  I have been using a 1/4" brass rod and hammer to get these out of the chamber.

I have tried thorough cleaning with solvent.  I have tried a couple minutes with a Hoppe's bronze brush (not sure how well that worked as it is intended for a .30 cal barrel, which is smaller than the chamber).  I'm thinking of spinning some 0000 steel wool in the chamber with a drill. 

Does anyone know a fix for this problem?
« Last Edit: June 22, 2021, 12:08:24 PM by Andronicus »
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Rocketvapor

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Re: Shells jamming in the chamber
« Reply #1 on: June 22, 2021, 12:31:29 PM »
After firing, the spent shell is stuck in the chamber.
Does the piston/op rod push the bolt back and the shell is stuck in the chamber?

In fact, when I put them in, they wont go all the way into the chamber, preventing the bolt from going into battery.
This is one of those "If it doesn't fit, force it" situations.   :shock:
Are these "old shells" fired cases? 
I have been using a 1/4" brass rod and hammer to get these out of the chamber.
That's doesn't sound all that safe.
So, you've done this more than once?

Assuming the gun used to work, Inspection with dummy ammo would probably be best. 

Shooting polymer coating steel ammo will leave a build up that can stick with brass cases. 



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Andronicus

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Re: Shells jamming in the chamber
« Reply #2 on: June 22, 2021, 01:46:01 PM »
After firing, the spent shell is stuck in the chamber.
Does the piston/op rod push the bolt back and the shell is stuck in the chamber?

In fact, when I put them in, they wont go all the way into the chamber, preventing the bolt from going into battery.
This is one of those "If it doesn't fit, force it" situations.   :shock:
Are these "old shells" fired cases? 
I have been using a 1/4" brass rod and hammer to get these out of the chamber.
That's doesn't sound all that safe.
So, you've done this more than once?

Assuming the gun used to work, Inspection with dummy ammo would probably be best. 

Shooting polymer coating steel ammo will leave a build up that can stick with brass cases.

The first time it jammed, the bolt came back, leaving the empty in the chamber with a damaged rim.  Subsequent times the bolt did not come back.

Yes the old shells are fired.  They cycle OK in my older Chinese SKS, but not in the 1982 SKS.

Using a 1/4 brass rod has been done on spent shells.  I think 3 times.
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Ghost225

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Re: Shells jamming in the chamber
« Reply #3 on: June 22, 2021, 02:04:51 PM »
After firing, the spent shell is stuck in the chamber.
Does the piston/op rod push the bolt back and the shell is stuck in the chamber?

In fact, when I put them in, they wont go all the way into the chamber, preventing the bolt from going into battery.
This is one of those "If it doesn't fit, force it" situations.   :shock:
Are these "old shells" fired cases? 
I have been using a 1/4" brass rod and hammer to get these out of the chamber.
That's doesn't sound all that safe.
So, you've done this more than once?

Assuming the gun used to work, Inspection with dummy ammo would probably be best. 

Shooting polymer coating steel ammo will leave a build up that can stick with brass cases.

I had this issue. Had to use brake cleaner and elbow grease to get it out. Have you shot and polymer coated ammo?

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Andronicus

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Re: Shells jamming in the chamber
« Reply #4 on: June 22, 2021, 03:46:55 PM »
After firing, the spent shell is stuck in the chamber.
Does the piston/op rod push the bolt back and the shell is stuck in the chamber?

In fact, when I put them in, they wont go all the way into the chamber, preventing the bolt from going into battery.
This is one of those "If it doesn't fit, force it" situations.   :shock:
Are these "old shells" fired cases? 
I have been using a 1/4" brass rod and hammer to get these out of the chamber.
That's doesn't sound all that safe.
So, you've done this more than once?

Assuming the gun used to work, Inspection with dummy ammo would probably be best. 

Shooting polymer coating steel ammo will leave a build up that can stick with brass cases.

I had this issue. Had to use brake cleaner and elbow grease to get it out. Have you shot and polymer coated ammo?
No, but I had recently been shooting Lacquer Steel Case.
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Rocketvapor

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Re: Shells jamming in the chamber
« Reply #5 on: June 22, 2021, 04:25:57 PM »
No, but I had recently been shooting Lacquer Steel Case.

Sam Ting.
Well I guess my new **** stirrin paddle don't work . I got a like . WTF 😈

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Andronicus

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Re: Shells jamming in the chamber
« Reply #6 on: June 22, 2021, 04:30:39 PM »
No, but I had recently been shooting Lacquer Steel Case.

Sam Ting.
polymer coating steel=Lacquer Steel Case?

What did you use as a solution?
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Rocketvapor

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Re: Shells jamming in the chamber
« Reply #7 on: June 22, 2021, 05:58:35 PM »
They cause the same issue. 
I use Hoppes and a brush. 
Well I guess my new **** stirrin paddle don't work . I got a like . WTF 😈

Flo just received her EXPERT Mid range card from the NRA.

https://www.yahoo.com/news/famed-ex-uss-john-f-003916449.html

Ghost225

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Re: Shells jamming in the chamber
« Reply #8 on: June 23, 2021, 09:48:05 AM »
Ive heard that CLP works well too

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Andronicus

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Re: Shells jamming in the chamber
« Reply #9 on: July 05, 2021, 12:45:15 PM »
I tired brake cleaner I left a few patches socked in brake cleaner in the chamber overnight, then cleaned with 0000 steelwool.  Maybe a slight improvement, but still no go. This is getting a bit frustrating.
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branflakes

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Re: Shells jamming in the chamber
« Reply #10 on: July 05, 2021, 06:04:14 PM »
Brake clean evaporates quickly. If using it you need to do physical cleaning as it is evaporating. Otherwise it is not going to do much.

If you want to soak it, use clp or diesel fuel. Diesel has oil in it too. Great for rust and carbon.  Clp will look like petroleum jelly the next day.  If you use a spray clp, hang rifle nose down a spray onto chamber letting it run out through bottom.  Use the brake clean after the "soak".
Maybe something like hoppes no 9 too since it helps break up the copper deposits too.

Seriously, remove down to only reciever and barrel. Soak in diesel. See if that helps.

As a test, use a crayon and color a round. Feed into chamber.  Maybe you can see where round is getting stuck.
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Lafayettegregory

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Re: Shells jamming in the chamber
« Reply #11 on: July 06, 2021, 12:04:23 PM »
No one mentioned a week or broken extractor spring? Or damaged extractor. That steel case stuff is some tuff ammo on extractors .

Greatguns

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Re: Shells jamming in the chamber
« Reply #12 on: July 06, 2021, 12:37:12 PM »
As Branflakes mentioned Brake Cleaner dissipates immediately. It is more for blasting out crud and chemical residue like cosmoine. You would be better to take some CLP, soak the chamber, then use a soft bristled .410 bore brush on a rod extension and run it in a hand drill at slow speed. After that then spray it with brake cleaner to clean it out and apply some trace amount of gun oil and run your bore snake through it to finish up. Also, inspect the chamber for burrs that are causing the casing to catch and hang up.
After that, as LG mentioned, I would be looking at the extractor parts. Rolled edge on the extractor, weak/broken extractor spring

LESchwartz

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Re: Shells jamming in the chamber
« Reply #13 on: July 06, 2021, 02:21:55 PM »
If extraction is weak, I would also check the gas system.

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xtriggerman

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Re: Shells jamming in the chamber
« Reply #14 on: July 19, 2021, 01:14:03 PM »
 Before I look at any thing cleaning wise, it normaly would be a chamber face peen that is the cause of hard to ge into battery and non ejection. The SKS has this particular flaw. when the bolt slams forward on an emply chamber, the 10-11 O clock area of the barrel chamber face gets a hammer blow from the bolt. This all ways causes a peen lip at that particular chamber lip area. This is what Greatguns was referring to. The fix is a careful dremil cut back on that peened lip and a slight polish of that cut. Then a good brush out cleaning and you should be good to go.
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