SKS-D, dimpled primers but no bang-bang

Armedsask

Armedsask

CGN Ultra frequent flyer
Rating - 100%
46   0   0
Location
Saskatchewan
Since I started using the Czech surplus ammo my SKS D has been running like crap. Every second or third round is a misfire. Pull the round and the primer is dimpled. Rechamber the round and it fires.

I'm guessing fireing pin issue? Maybe an ammo issue? Has any one else had this problem?

I'm going to pick up some Norinco 7.62x39mm and see if that solves the problem (Yes I know where to find some).
 
FWIW,I have only had 1 dud round out of crate of Czech stuff. Because your getting the round to fire the second time I would lean towards your firing pin being the issue.
 
Armedsask said:
Since I started using the Czech surplus ammo my SKS D has been running like crap. Every second or third round is a misfire. Pull the round and the primer is dimpled. Rechamber the round and it fires.

I'm guessing fireing pin issue? Maybe an ammo issue? Has any one else had this problem?

I'm going to pick up some Norinco 7.62x39mm and see if that solves the problem (Yes I know where to find some).
Click to expand...

I have some Czech and so far no misfires. can you post a pic of a dimple?
 
How much cosmoline is in the bolt and on the firing pin?

Had a Mauser a couple weeks ago that wouldn't even strike the primer because the pin was so full of cosmoline. Had to disassemble the bolt and clean it up.

Try a full bolt teardown and cleaning first. I have used two crates of Czech ammo without any problems.
 
Soak the crap out of the firing pin channel with brake cleaner. They get gummed up over time and the Czech surplus has slightly harder primers than the Nork ammo.
 
This is not a cosmoline or dirty bolt issue.

As the SKS is around 10 years old, I'm leaning towards needing a new fireing pin. I never had any issues with the Norinco ammo, problems didn't start until the Czech stuff. Does the Czech ammo have harder primers?

can you post a pic of a dimple?
Click to expand...
Pick up a piece of fired brass and pretend the fireing pin dimple is half as deep, that's what the primer looks like.
 
Last edited:
A previous post dealt with this issue .
It ain't the ammo .
It's the firing pin .
Over time they flatten out the tip and are to blunt to ignite ever primer .
To fix it :
Remove the firing pin from the bolt .
Wrap it in tape and chuck it up in a drill .
Spin it up and use a stone to carefully reshape it into a rounded profile .
DO NOT make a centerpunch out of it !!!
Just reshape it , a little at a time if nessessary .
You will probably have to do this every 1000 to 1500 rounds or so .
I didn't invent the fix but it works great .

** if you are going to change the pin , make sure you get the right one . They have about 4 different types that don't interchange . **
 
Here's another"FWIW" after I replaced my factory hammer spring with a lighter one from Wolf s I had an increase in FTF with the same ammo that was workig without fault in another sks that I had with me. It was too bad that this increase in FTF happened as the trigger felt alot better after the installation. Another circumstance happened due to a headspace problem from a poorly seated barrel. The op rod spring was visible in front of the housing. Meanig the barrel was not "on" far enough.... Took that one back and got a new one. So there is always more situations than meets the eye.
 
Last edited:
RUPZUK said:
A previous post dealt with this issue .
It ain't the ammo .
It's the firing pin .
Over time they flatten out the tip and are to blunt to ignite ever primer .
To fix it :
Remove the firing pin from the bolt .
Wrap it in tape and chuck it up in a drill .
Spin it up and use a stone to carefully reshape it into a rounded profile .
DO NOT make a centerpunch out of it !!!
Just reshape it , a little at a time if nessessary .
You will probably have to do this every 1000 to 1500 rounds or so .
I didn't invent the fix but it works great .

** if you are going to change the pin , make sure you get the right one . They have about 4 different types that don't interchange . **
Click to expand...

I agree 100%. I did this to all my older firing pins and it worked. A word of caution: if the firing pin goes to far it will puncture the primer resulting in an ugly smelly mini kaboom in your receiver.If you're not familiar with the process visit your local gunsmith , please.
Czech ammo primers need more punch for sure.
 
When you order a new firing pin, you might as well order a new spring as well.
Click to expand...
Spring? Recoil spring or is there supposed to be one in the fireing pin?

I tried filing the point but I probably just didn't do it good enough. I'll try that again. too bad I won't have it fixed for the weekend. :(
 
Armedsask said:
Spring? Recoil spring or is there supposed to be one in the fireing pin?

I tried filing the point but I probably just didn't do it good enough. I'll try that again. too bad I won't have it fixed for the weekend. :(
Click to expand...
I guess he meant hammer spring but I don't think you need to change one unless it's broken. The SKS hammer strikes really really hard , much harder than AK hammer.
 
The SKS hammer strikes really really hard , much harder than AK hammer.
Click to expand...
I thought that may be my problem, my SKS uses an AK hammer and spring, but then I remembered that I had this issue before making it take the AK fire control group.
 
Since you had to modify your AK hammer to reach the SKS firing pin you accidantally might have changed the angle at which the hammer strikes the pin. There is a slight chance that the hammer might end up resting on the bolt's body itself before it has a chance to push the firing pin all the way in.
Check it carefully just for the sake of eliminating this possibility.
 
Armedsask said:
I thought that may be my problem, my SKS uses an AK hammer and spring, but then I remembered that I had this issue before making it take the AK fire control group.
Click to expand...
Did you ever fix this problem? I am asking because my SKS is making just a dimple on some rounds and a deep pocket on the primer of others with Czech ammo as well. It sounds like the same problem you are having.
 
You must log in or register to reply here.
Back
Top Bottom