The Swiss 540 is reputed to be the finest kalashnikov made.
Except it isn’t actually a Kalashnikov pattern weapon. While the system was clearly inspired by the AK mechanism, there are major differences that take it out of the AK family. The recoil spring isn’t in the receiver, it’s in the gas tube wrapped around the piston. The trigger and safety mechanisms are also completely different and resemble the HK G3’s. No parts interchange, either. And the 540 is less reliable than the AK. Did I mention that it was made in France by Manheurin?
To say the 540 is an AK is like saying the Chevrolet small block V8 is a Ford flathead V8.