SKS problem - dented primers

H Wally

H Wally

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Hwell hwell hwell - I appear to have discovered a problem with my sks.

Here's the problem - when the trigger is pulled, the hammer is released, strikes the firing pin, firing pin dents the primer, but no firing. Usually takes a total of 2-3 tries to get it to fire, after which it cycles the bolt and the process is repeated.

1) I have lengthened the firing pin, which reduced the #### and click problem to 2 times. Before it was 6 or seven recocks to a single shot.

2) The ammo fires well in CZ 858's, all other sks', with absolutely no hangfires or abnormalities. Only ever happens with this gun.

I have increased hammer weight, and it helped a little. I have checked for binding on the trigger assembly, against the reciever, and inside the bolt. Nothing. I'm just looking for reassurance that it is the spring that needs strengthening...

Ideas?
 
STOP SHOOTING THIS GUN NOW!!!!!!

There is a strong possibility that you have one of the mongrel reciever barrel combinations, and your barrel is pounding it's way forward with each shot. The headspace in such a gun will grow until a case head seperation results.
 
Joy.

I may have isolated another problem, as the barrel is threaded as far as I can tell, and functioned fine originally.
 
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H Wally said:
Joy.

I may have isolated another problem, as the barrel is threaded as far as I can tell, and functioned fine originally.
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The suspect firearms had threaded recievers with an adapter installed to allow press fit barrels to be installed. They were then cross drilled and pinned.

Most worked fine for several hundred rounds before beginning to puke out the barrels.
 
If a gun has a problem, any problem. STOP. figure out exactly what the problem is. Do not simply throw ideas at it hoping it will fix its self before it hurts you or someone else.
That longer firing pin might just of caused you more problems then you could of solved! Your original problem was FTF you upgraded to possible punctured primer or worse a head seperation from making the gun go bang when it told you it should'nt!

Get measuring tools.
 
If that's the case, it always helps when questions are presented with sufficient info to allow generous members to actually assist.
 
Andy said:
If that's the case, it always helps when questions are presented with sufficient info to allow generous members to actually assist.
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True enough. When I asked the sks question I didn't have permission to introduce the topic, so I had to remain ambiguous. I have recieved some good and useful advice though, so thanks to everyone!
 
great project concept, but one look at the extent of that welding and I am very concerned for you.

Your trigger group is also no longer pinned to the reciever so what ever slop is in the Bolt you used as a hinge is dampening the impact of you firing pin. Are there still threads on that Bolt??!!

Again I think that your concept is brilliant and looks like something worth while to build. However 45,000PSI is not something to learn on.

How did you design the gas handling capability of this unique rifle. I/e where do escaped gases go?

Is the disconect in the FAL guts?

If you start this project again from scratch loose the weld at the reciever ring!

T9o be honest I'd say take what you have learned from your first attempt as cheap education and start again with another SKS. It will be worth it for an extra 50 bucks. And in the future when you look at the reciever ring on that one you wont regret it.

Great project, it is really visionary.

P.S
the barrel is threaded as far as I can tell,
Click to expand...
that aint good enough bud. you gotta know exactly what you are working on! cheers
 
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david doyle said:
great project concept, but one look at the extent of that welding and I am very concerned for you.

Your trigger group is also no longer pinned to the reciever so what ever slop is in the Bolt you used as a hinge is dampening the impact of you firing pin. Are there still threads on that Bolt??!!

Again I think that your concept is brilliant and looks like something worth while to build. However 45,000PSI is not something to learn on.

How did you design the gas handling capability of this unique rifle. I/e where do escaped gases go?

Is the disconect in the FAL guts?

If you start this project again from scratch loose the weld at the reciever ring!

T9o be honest I'd say take what you have learned from your first attempt as cheap education and start again with another SKS. It will be worth it for an extra 50 bucks. And in the future when you look at the reciever ring on that one you wont regret it.

Great project, it is really visionary.

P.S
that aint good enough bud. you gotta know exactly what you are working on! cheers
Click to expand...

Welding - I agree with you actually. I knew that I was going to get comments on it, but it's what I could do when I could do it. - That was my first time running a mig welder, it was 3 am, and it had to be completed for 8 am. Otherwise, I'd have been taking the time to practice beforehand.

Bolt is tight in there - I'm using it because I put it on and take it off so often I'd probably add hours to my project if I had to grab a screwdriver each time. Bolt has a shim on it to protect the lower. The entire assembly locks up tight, but once I've taught myself to weld further I'll be adding a plate on either side of the reciever to brace it further.

Gas handling is the same - Gas system is unaltered, and the back of the reciever has been over braced with stick welding and some thick plate ( I can do that).

The disconnect is a rig job I've built in that I'm working on - I am still only halfway on the project. I've been test firing the live rds with a rig so that I'm not holding it, or alternatively I test fire with only primers.

I also agree with the reciever ring weld - Each of those spots is a single weld however, as I had a wet cloth inside the reciever and another around the weld to keep the heat down. The reciever was almost cold to the touch for the entire time.

As for the barrel - I haven't had anyone else tell me it's threaded or otherwise, but there are no pins and it has two flat opposing notches for a wrench, so I figured there was not much else it could be. Looks like the rest of my rifles that are threaded so that's what I'm going on.

Good to have constructive criticism though - that's mostly what has allowed the project to get this far.
 
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