Sorry to revive an old posting...
But, Lone Eagle, you said that you replaced your rear sight with an RPK rear sight and I had a couple questions.
Did you put this on a Centurion C-39?
Where did you buy yours?
I ask because I am going to do the same swap but I do not know which RPK sight will fit/ work.
I have seen ones that go up to 8 and others go up a bunch more and are much longer.
I was told the one with 8 notches will fit, but I need someone that has actually put one on to say whether or not it will work.
I found a Bulgarian RPK rear sight with 8 notches at K-Var.
I almost bought it, but at $63, I wanted to be 110% sure.
I am also looking to buy the Bulgarian recoil spring assembly too as I hear the C-39 has one that is supposedly not correct.
Someone on youtube had one break. Not sure if it was just a one in thousands instance, but a backup part/ spare would be nice.
Any help is appreciated!