Dont feel to bad about not shooting well with an SKS, they are known for not being really that accurate, they are fairly inexpensive, cheaply built, with a military surplus rifle, you get what you pay for.
Since I live in the middle of nowhere AK
we dont have a recycling center and especially not one for electronics, so we dispose of them the fun with, at the hot end of a firearm.
Although not really an assault rifle, I have a stainless ruger mini-14 but with a 30round magazine, it has lots of firepower. A few notes about the mini-14, well at least mine, it is very loud, the short barrel makes that thing bark hard. At twilight the muzzle flash is impressive, more so than other guns I have seen shot at low light. The ejector is very efficent. It throws the spend casings well over 30 feet. Try not to have many people off to your right when shooting one, hot brass down someones shirt will ruin thier day.