For what my opinion is worth.... the best thing you can do to a S.K.S. (C.K.C) is NOTHING,... leave it the fuck alone.
No after market anything.
It's a decent battle rifle with above average performance.
don't fuck with it.
adding anything just hurts the performance.
I wouldn't feel too bad if I was sent to battle with one, the track record of the weapon speaks for itself.
Start adding shit to it and you just start adding problems.