*disclaimer* I don`t know what I`m talking about, I read things, usually get them mixed up with other things and then spew them back out, feel free to correct me *disclaimer*
To check to see if there are any problems with teh sear engagement surfaces, take an EMPTY rifle, #### it, and thump the butt against the ground a couple of times, if there`s a problem with the sear it will slip and the hammer will fall.
I was reading something else about trigger creep, I think it was on surplusrifle about do it yourself trigger jobs on the sks, or on Kivarii`s trigger jobs. negative engagement, hammer moving forward before it moves back to avoid ad's....I dunno anymore, search it on surplusrifle forum or on sksboards