SKS trigger job

You are severely mistaken with regard to the build quality and level of craftsmanship on the Soviet SKS. I suspect this has more to do with the quality of the Candaian imports than anything else.

If you encounter a sks sear with positive sear to hammer engagement, 100% guarantee that it was modified post production.

Matching serials dont mean original parts.
 
I take it back. I highly encourage you to do trigger jobs on all of your sks's.

I've done many, never an unsafe incident. Thats the curious difference between knowing what you're doing and what you're suggesting.

You're really testing limits of your GED.





The sear spring only returns the sear to it's intial position once the hammer releases. It has zero strength to overcome the force of the hammer spring or the friction coefficient of the sear-to-hammer engagement.

Nor does it need any strength to overcome that friction. A positive sear engagement has no desire to push the sear out from under the hammer, therefore negating any unsafe condition caused by a negative sear angle.

So what exactly should have my malfunctioning SKS' done after proper trigger jobs? Shot someone? Mag dumped full auto? Coughed up fairy dust and produced a soviet genie?
 
So what exactly should have my malfunctioning SKS' done after proper trigger jobs? Shot someone? Mag dumped full auto? Coughed up fairy dust and produced a soviet genie?

I don't know what was wrong with your carbine, what you had done or who did it. But I would never go afield with an sks in conditon one if it had a modified sear. I'll take my heavy, gritty, long pull trigger and neutral or minimally negative hammer travel over the modified gun-- 100 times out of 100. Why? Because it was designed that way.

What I do know is this: The high friction coefficient between the sear and hammer consitute 99.9% of the sks safety function. When you alter the bearing surfaces of either, you alter the safety function of the rifle as it was designed, manufactured and issued for more than a half century.

You learn something new every day.

Apparently the 'G' in GED stands for Genius. Maybe you should invent a time machine and go back and tell the Soviets, Chinese, Yugoslavians, Romanians, Albanians, and North Koreans that they were all mistaken. Fifteen million + rifles later and it wasn't until you stumbled onto the scene and figured out they'd been doing it wrong for more than fifty years.
 
You are severely mistaken with regard to the build quality and level of craftsmanship on the Soviet SKS. I suspect this has more to do with the quality of the Candaian imports than anything else.

If you encounter a sks sear with positive sear to hammer engagement, 100% guarantee that it was modified post production.

Matching serials dont mean original parts.

Yes SKS rifles are excellent quality.Amazing manufacturing process and design. Just like Lada cars.
 
Yes SKS rifles are excellent quality.Amazing manufacturing process and design. Just like Lada cars.

And the USA made the M16.

They also made the corvair, the pinto, amc, and the Pontiac#####. None of those made it very far in the production run. But somehow they're still pumping out Ladas.

Go figure.

Also: So, what? It didn't stop you from buying one. Apparently one in crap conditon.

Apples. Oranges.
 
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I don't know what was wrong with your carbine, what you had done or who did it. But I would never go afield with an sks in conditon one if it had a modified sear. I'll take my heavy, gritty, long pull trigger and neutral or minimally negative hammer travel over the modified gun-- 100 times out of 100. Why? Because it was designed that way.

Yes you do know, or you should based on your statements. You clearly stated that modifying the SKS trigger makes it unsafe. Mine was modified but displayed no unsafe behaviour. So it was, by your definition, malfunctioning since it was modified but not doing anything unsafe. So which is it? Was it unsafe with a trigger job or perfectly fine with a trigger job?

What I do know is this: The high friction coefficient between the sear and hammer consitute 99.9% of the sks safety function. When you alter the bearing surfaces of either, you alter the safety function of the rifle as it was designed, manufactured and issued for more than a half century.

Try learning a little more to expand your knowledge.

You learn something new every day.

Unless you choose to ignore new info.

Apparently the 'G' in GED stands for Genius. Maybe you should invent a time machine and go back and tell the Soviets, Chinese, Yugoslavians, Romanians, Albanians, and North Koreans that they were all mistaken. Fifteen million + rifles later and it wasn't until you stumbled onto the scene and figured out they'd been doing it wrong for more than fifty years.

Doing what wrong, exactly? Or are you trying to tell me that my choice to improve on an old design somehow equals an admission that something was done wrong in the first place?

I appreciate your prompt response to clear up these anomalies between your statements and reality.
 
I've read through this thread twice and I've been reading up on the SKS but I still can't decide if changing the trigger engagement on an SKS is safe or not. My SKS has slight negative engagement. Boris thinks that is fine b/c the trigger was designed that way and there is enough friction to keep the tigger safe. Fair enough, BUT I don't understand why positive engagement wouldn't be just as safe while giving you a better shooting trigger. Is there any real danger from making the engagement slightly positive? Sure the hammer would rest closer to the firing pin but the sear wouldn't have pressure on it wanting it to move towards releasing the hammer. This would seem to counteract the risk of unintentional discharge from loss of friction. Thoughts?
 
You might want to check out the American Gunsmith SKS video courses. They have the full armourer course and a trigger job course. If you look on youtube you will see excerpts. If you're good at internet searching, you may find copies of these videos. These are older videos, but they are by a gun smith instructor. The legit DVD's are also for sale.
 
I've read through this thread twice and I've been reading up on the SKS but I still can't decide if changing the trigger engagement on an SKS is safe or not. My SKS has slight negative engagement. Boris thinks that is fine b/c the trigger was designed that way and there is enough friction to keep the tigger safe. Fair enough, BUT I don't understand why positive engagement wouldn't be just as safe while giving you a better shooting trigger. Is there any real danger from making the engagement slightly positive? Sure the hammer would rest closer to the firing pin but the sear wouldn't have pressure on it wanting it to move towards releasing the hammer. This would seem to counteract the risk of unintentional discharge from loss of friction. Thoughts?

Boris is right.. all the SKS's ive come across have a neutral or slightly negative sear engagement. Its a combination of the friction between the hammer and the sear, and the intense pressure from the mag floor plate release spring that purely dictates how secure the sear is under the hammer. Will changing the angles on the engagement portion of the sear to a positive slope make the trigger safer ?? if the surface finish of the sear is the same as the stock one then yah of coarse it would. Why? because then for the sear to become dislodged from under the hammer the forces that are manipulating the movement of the sear (the trigger weight) would also have to overcome the intensity of the hammer spring slightly. Resulting in a more jammed sear under the hammer than before... but heres the catch, also resulting in a heavier trigger pull weight. Its really simple physics! if the trigger requires 12lbs of the force to fire. Then it took 12lbs of force to dislodge the sear from under the hammer! (Im disregarding the mechanical advantage of the trigger mechanism people). Where as a 4lb trigger required only 4 lbs to dislodge the sear from the hammer (thus being less safe).

Even if the positive engagement has a heavier trigger pull weight, it doesnt mean it cant be overall a better trigger than the stock trigger. You can make a positive engagement have a shorter break travel (aka creep), or have a less gritty pull. And then throw in an overtravel stop just to make things feel even nicer!
 
I've read through this thread twice and I've been reading up on the SKS but I still can't decide if changing the trigger engagement on an SKS is safe or not. My SKS has slight negative engagement. Boris thinks that is fine b/c the trigger was designed that way and there is enough friction to keep the tigger safe. Fair enough, BUT I don't understand why positive engagement wouldn't be just as safe while giving you a better shooting trigger. Is there any real danger from making the engagement slightly positive? Sure the hammer would rest closer to the firing pin but the sear wouldn't have pressure on it wanting it to move towards releasing the hammer. This would seem to counteract the risk of unintentional discharge from loss of friction. Thoughts?

My main concern is safety.

If you're comfortable getting a trigger mod, by all means do so. But keep in mind that many of the sks variants available today are 40-70 years old and the vast majority of them are well worn. If you've got a lot of negative movement already, you would do well to consider a trigger overhaul instead of modifying already worn out parts.

The sks trigger was designed to create a specific, very high coefficient of friction with the involved parts contacting at specific angles and with specific spring tensions in order to maintain that very high coefficient. Stoning angles onto a sear surfaces that were purposely designed to be flat will alter those specificatios and intended pattern of wear, and likely shorten the functional lifespan of the sear to hammer engagement.

If you want an alternative, yet engaging accuracy project, free float the barrel and bed the stock. After that you can even tempt the longer distances by tapping the reciever to mount a pu type scope (Accumounts makes a really great replica PU specifically for the sks). Dont forget range time and muscle memory will only benefit accuracy.

The sks was not designed nor was it ever intended for DMR accuracy. Having said that, there are ways to accurize the platform. And a trigger job is certainly one way to increase accuracy, but it is the least effective and carries with it an indeterminate compromise in the safety funtction of the rifle as it was designed.


If you want a smoother trigger, by all means do so. But absolutely get it done by a professional.
 
I' didn't read all the crap, the agi sks trigger course is the best I have seen to date. If you do a trigger job you must test it and test the safety and bump test it. The sks trigger is easy and complex. It should have neutral or safer positive engagement of the sear, the sear must engage the hammer in a way it won't "skip" . The take up is what it is, the trigger bar is a hard part to make or lengthen.
I have found
Remove grit, burrs, rough surfaces
Work sear, for creep and engagement
Test
Test at range
Do it all over again
Test at range
Be happy
 
Dont send your assembly away for work needed, try to find a gunsmith in your locale as he will need the rifle to test for safety after he reworks the trigger, and to those wanting to D.I.U., I wouldn't recommend that , you will ruin a couple of sears and may turn your baby into a chopper, also you can have travel and creep improved but to lighten pull you may need a lighter spring, but what do I know.
 
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