Kalashnikov rifles are better than armalite rifles because:
1: less moving parts, meaning they jam less often
2: the magazine release's position allows for faster reloading, plus instead of having to use momentum by spinning the gun slightly, or yanking on the magazine (like armalite rifles) if you just trigger the magazine release the magazine drops out.
3: kalashnikovs are generally cheaper, you can get one for less than 500 dollars usually.