The success of the Kalashnikov is due to its resilience and it simplicity. I learn to dismantle one just in looking at the mechanism. It s simple. If you try to do this with a FAMAS, you will go for big trouble (especially with the extractor system). The M.14 was inferior and the M.16 (and later) too sophisticated. At the time of the AK47 (47 being the year or production) look at what the others had to offer. About the Stgwhr 44, if it was so good, why no country used it?
Kalashnikov is the equivalent of Henry, inventor of the Winchester. He created a weapon that will be the symbol of the fight for freedom and independence for some and horrible dictatorships for others.