Mine passes the bump test too. I went wild on the trigger group with a rubber mallet and the sear will not slip no matter what. But it still bumpfires unintentionally. I do think the lack of over travel is to blame honestly.
SKS Trigger job
- Thread starter mikeystew
- Start date
Bubba Yugga
CGN frequent flyer
- Location
- Midwestern Ontario
I believe the phenomenon you're experiencing is called doubling. I got that on newly acquired SKS'S when squeezing off shots with a very stiff finger at the bottom of the trigger.
A combination of polishing the sear notches and the rails the sear travels on, along with some grease and a proper trigger follow through ended the problem.
Never had a doubling after that.
A combination of polishing the sear notches and the rails the sear travels on, along with some grease and a proper trigger follow through ended the problem.
Never had a doubling after that.
I did polish the sear and gave it positive engagement, polished the sear guide slots and rails etc... Only factor I think I got wrong was adding the over travel screw. I wasn't getting much of any trigger follow through to speak of. Click-stop. I took the over travel screw out completely and will test it like this first before further modifying anything else.
Except u actually need to hit the gun on the ground barrel first to simulate the recoil the sear is experiencing. Of course hitting the barrel on the ground is bad, so u take out the trigger group, and magazine latch, and hit the barrel side of the trigger group modestly on something hard. Then see If the sear slips out.
Bubba Yugga
CGN frequent flyer
- Location
- Midwestern Ontario
Simulating bullet recoil effects on the sear doesn't help much, since the hammer is still forward at that time, as well as the sear itself.
By the time the bolt carrier and bolt have pushed the hammer back out of the way, there's a whole other dynamic going on.
I suspect the design expects the trigger bar to move further forward and then get itself nudged down out of the sear's way so the sear can return back under the hammer's claw.
By limiting the trigger bar's forward movement, I think it stays jammed against the sear, thus allowing the doubling to take place.
It's probably a very unstable geometry which is why it's so random.
By the time the bolt carrier and bolt have pushed the hammer back out of the way, there's a whole other dynamic going on.
I suspect the design expects the trigger bar to move further forward and then get itself nudged down out of the sear's way so the sear can return back under the hammer's claw.
By limiting the trigger bar's forward movement, I think it stays jammed against the sear, thus allowing the doubling to take place.
It's probably a very unstable geometry which is why it's so random.
Big JD-From the hills
CGN Ultra frequent flyer
- Location
- Saskatchewan.
if the sear does not control the hammer it will misfire every time (it rides the bolt) The disconector seems to work 100% no matter how much or little over travel there is.
Big JD-From the hills
CGN Ultra frequent flyer
- Location
- Saskatchewan.
Removing the over travel screw cured mine.
I will for sure when I rule out the issue. I still suspect my over travel screw is to blame, and that wasn't a part of the instructional video at all.
