@ EL34/6L6:
Look, SONNY, we don't diss you because you're just a kid, but this is the MILSURP forum. We have guys on here who were being SHOT AT with SKSs before you were even a gleam in Daddy's eye.
You might cut THEM a bit of slack, too. Some of them just might know a thing or two that didn't come out of a Tapco manual.
The first rule of designing any military firearm is KISS: Keep It Simple, Stupid. The SKS, as built, is simple and reliable. Its single weak point was and remains the corrosive ammunition.
Seriously, do you think that Russia doesn't know how to make plastic? They know very well how to make it, but they built the SKS with WOOD or LAMINATED wood because it STOOD UP better. It is only in recent years that plastics have been developed which remain relatively stable. In a cold climate such as we have here in our North, a plastic stock will shatter in the cold, leaving you without a weapon. Why else do you think the Number 4 Rifle, although an antique by most estimations, remains the rifle of CHOICE among our Rangers?
Chemically, Germany was the world's most advanced country as far as plastics were concerned in the WW2 era. They used phenolic-resin plastics for handguards on the Kar-43, for the handgrips on the MG-42, the P-38 and the StG-44 and for the OUTER frame (the grip portion) of the MP-40. But that was IT. And those ALL were parts which could be replaced quickly and easily. Breaking ANY of them did not stop the weapon from being USED.
Modern plastics are a lot better, but MOST of them still harden (due to outgassing) after they are made and they do NOT tolerate ultraviolet light very well. NO country wants to get into a war, open up its War Reserve arsenals... and have 8 million rifles crumble into dust before their eyes. THAT is why the Russians used Arctic Birch and Laminates for the SKS. They used the same things for the first 25 years of AK production, too, for the same reasons: plastics were not yet advanced sufficiently.
THINK before running off at the keyboard.
And try to cut down on the gratuitous insults.
You'll make a lot more FRIENDS.