My 20 year old Chinese SKS started to double fire so I took bolt apart and cleaned it up nice. Reinstalled and it's doing it again. Maybe domething is worn out. Might order a Murray's pin unless someone has a bright idea. 
SKS double fire
- Thread starter Gatehouse
- Start date
My 20 year old Chinese SKS started to double fire so I took bolt apart and cleaned it up nice. Reinstalled and it's doing it again. Maybe domething is worn out. Might order a Murray's pin unless someone has a bright idea.
Keep it clean, especially the bolt carrier. Switching from surplus mil ammo to commercial can be an issue at times. What ammo were you shooting at the time?
Phat Eagle
CGN Ultra frequent flyer
- Location
- Fraser Valley, BC
Yup, probably need Murray's pin... Is that the one that gets a fair amount of use??
Murray pin has reputation for breaking.
If it's double firing then something is wrong and it's unlikely to be your firing pin specifically. If the gun used to function fine with the stock firing pin i would be trying to fix it. Check for burs on the pin and in the carrier where it might be snagging on maybe?
Does it only fire twice? Or does it go full auto and burn the clip? Does it fire when you #### it or only when you pull the trigger?
If it's double firing then something is wrong and it's unlikely to be your firing pin specifically. If the gun used to function fine with the stock firing pin i would be trying to fix it. Check for burs on the pin and in the carrier where it might be snagging on maybe?
Does it only fire twice? Or does it go full auto and burn the clip? Does it fire when you #### it or only when you pull the trigger?
a worn out firing pin gives you no-fire, not double taps. However a sticking firing pin (corroded, bent, etc) can cause problems. Take it apart. That pin is supposed to float. If it isn't floating very freely, then you have identified your problem.
I would check the FP to make sure there is little chance of it sticking. The rattle test isn't enough. Give the back of the pin a tap on a table or desk to drive it forward. Not hard just a firm tap. It should release from the taper easily. I have used mild abrasive powder to polish the inside of FP channel up where the taper is and the taper of the FP itself. Also, using Murray's web site, cleaned up around the FP hole on the bolt face. The "Volcano" effect on the bolt face is usually related to popped primers etc.
You may want to take apart your trigger group to make sure there isn't a bunch of gunk in there especially around the sear.
If the sear can't move back freely under spring tension the hammer will be held by the dis-connector until the bolt is full battery. If the sear isn't there to engage the hammer, the dis-connector releases the hammer when the bolt drops down.
Make sure your dis-connector is working as well. I replaced my dis-connector due to gritty trigger pull. The dis-connector gets worn on top where the bolt contacts it and it slowly creeps up moving the trigger bar upwards where it can contact the TG housing. This can cause the hard/gritty trigger pull in the first stage of taking up slack and in the engagement/movement of the sear.
If you are shooting mainly surplus ammo, the Murray pin with the spring may cause first strike FTF's.
You may want to take apart your trigger group to make sure there isn't a bunch of gunk in there especially around the sear.
If the sear can't move back freely under spring tension the hammer will be held by the dis-connector until the bolt is full battery. If the sear isn't there to engage the hammer, the dis-connector releases the hammer when the bolt drops down.
Make sure your dis-connector is working as well. I replaced my dis-connector due to gritty trigger pull. The dis-connector gets worn on top where the bolt contacts it and it slowly creeps up moving the trigger bar upwards where it can contact the TG housing. This can cause the hard/gritty trigger pull in the first stage of taking up slack and in the engagement/movement of the sear.
If you are shooting mainly surplus ammo, the Murray pin with the spring may cause first strike FTF's.
Well the whole thing is pretty clean but I'll take it apart again and look for burrs.
It rattled fine when I had it apart.
Used lots of different ammo in this rifle with no problem, at least 1000 rounds of this stuff (dominion) last year. The rifle sees lots of use as clients shoot it often. It's sporting an Archangel stock with Tapco mags now but can't see how that's an issue. It wasn't when I first installed it, anyway.
It mostly doubles but once went full auto.
Thanks for the suggestions.
It rattled fine when I had it apart.
Used lots of different ammo in this rifle with no problem, at least 1000 rounds of this stuff (dominion) last year. The rifle sees lots of use as clients shoot it often. It's sporting an Archangel stock with Tapco mags now but can't see how that's an issue. It wasn't when I first installed it, anyway.
It mostly doubles but once went full auto.
Thanks for the suggestions.
Phat Eagle
CGN Ultra frequent flyer
- Location
- Fraser Valley, BC
Look out! Now the CFC will issue a bulletin that all Chinese made SKS must be inspected to ensure they can't go full auto... Think of the children!
If it worked fine before you restocked it, that would suggest that the malfunction has something to do with the new stock. Perhaps the stock is making contact with parts of the trigger mechanism. Put the original stock back on, see if that makes a difference. If it does, then see where the new stock is interfering.
Phat Eagle
CGN Ultra frequent flyer
- Location
- Fraser Valley, BC
My SVT does this all the time... You have to suck it RIGHT into the shoulder or you will get double or even triple taps...
Does it when I shoot it too. Worked fine after I put new stock on- at first. It's possible things have moved so that's always a possibility.
It does seem to do it more when holding onto the front pistol grip. Maybe there is some flex there causing bump fire?
Is there any other aftermarket pin other than Murray's that does the same thing but won't break?
It does seem to do it more when holding onto the front pistol grip. Maybe there is some flex there causing bump fire?
Is there any other aftermarket pin other than Murray's that does the same thing but won't break?
It could possibly be something in your trigger group, a worn down sear will slip out from recoil resulting in burst fire, or even a complete mag dump if its bad enough. I overground one of my sears while doing an experimental trigger job ONCE, it resulted in exactly what you describe. An overground sear could be easily fixed by replacing it, OR installing a stiffer mag release spring. I use the Dominion Arms ammo aswell and have been noticing firing pin marks on the primers of chambered BUT unfired shells; ive heard that Dominion arms ammo uses soft primers appose to the hard corrosive primers found in surplus. The marks make me worry about the chances of a slam fire with this type of ammo....
I will most likely be ordering a murry firing pin to solve the primer marks in the future...
I'd go easy on here talking about things going full auto . as others said the commercial ammo has soft primers and the military surplus ammo has harder - mil spec primers .if I was you I would take a sear out of another sks and try it in your gun . and if it does'nt burp twice then it's the sear. I had problems with my ruger mark 2 slam fireing after I let the bolt go and it burped once.
so I tore it apart and I found when I had cleaned it the pin that holds the sear in place had fallen out of one hole . so I replaced it and shazam it was fixed . or if you have another sks take the trigger group out of it and put it in the one your haveing problems with and see what happens . good luck
so I tore it apart and I found when I had cleaned it the pin that holds the sear in place had fallen out of one hole . so I replaced it and shazam it was fixed . or if you have another sks take the trigger group out of it and put it in the one your haveing problems with and see what happens . good luck
