Eastern block countries like "robust" engineering!! They are built like tanks and as heavy as one at times... have you seen the scopes they use compared to the more modern and sleeker American/Euro stuff. Then again they do work and take a beating, just look at the AK, not so pretty (well to me they are) but no one can say they aren't great for what they are built to do!!
Not super familiar with the Zastava M70 pistol, just the 16" barrel AK M70. They are all really just CZ clones aren't they?