I wouldn't try to change anything about these rifles.
They are far from the nicest SKS out there fit and finish wise but are interesting and desirable nonetheless.
Mechanically they shoot as well as ant other, nice triggers on these in particular.
Yes the mold line is pronounced (actually not even a mold line, the stock was molded in two halves then bonded together), and the fit of the stock to the rifle isn't inspired, very roughly done. But the stocks are distinctive, enjoy them for what they are.
The rifles are nice representative examples of late Chinese production and extremely collectible, especially being the condition they're in is factory new unfired. They shot as well as any other SKS, and the stocks while ugly ( I think they look cool) are tough. Shoot them or collect them the Chinese SKS are the best buy on the gun market right now.
No matter how many SKS in your collection the jungle stocks are a good addition to it.
Anyone's who been into guns for at least a few years is missing the old days. Well as long as these can be had at $500 and you can still get ammo by the case the times are still good.