A New Direction?

The AK-47 Avtomat Kalashnikova the mos recognized weapon in the world, 

The AKM was the undated version of the AK47

Then in the 1970's Avtomat Kalashnikova produced the AK74

What I find truly amazing is that after producing AK48 , how they went on to actual design and build the later models

AK-48 

I would have thought the munchies alone would have made any further development impossible.

Or was that a different AK?