It really depends on what you plan on doing with your SKS. Firstly.. they are great "out of the box" I have had both..china & Russian. For some reason I always got a little better accuracy from the china model. You can set it up for Hunting, 3 Gun comp.,range plinker ECT. I don't bother getting into the Black Stock thing anymore, its fun,..been there done that...now I just set them up to be accurate and functional. Here are some mods I like to do...
1- get rid of the Bayonet "lighter carry Bush gun"
2-attatch sling "needed for tromping through bush"
3- Closed bolt modification. Simply grind off the left & right edge of the bottom of the bolt, now the magazine will go right in with a closed bolt.
4- Dremell out wooden stock to fit tapco mag.
5- extend the mag release ,"original one is very small." I just weld on a little tab.
6- setting the SKS for long range. simply remove bayonet and install this "light weight" bipod.
7- trigger job with lighter springs. "really helps" Be careful on the mag realease spring "it also works the SEAR. If you put a very light spring in, you'll be in for a surprise.
8- Mag wege full rail for optics "up graded version." one piece.
9- A name brand scope. I like Redfield 3x9 Revenge. $200 at Frontier fire arms. Excellent, very clear , holds zero. Never had much luck with Nc star.