Generate a correct and concise answer for the question based on the words in the context.

Context : The Ak 5 or Automatkarbin 5 (''automatic carbine 5'', ''automatic carbine'' being the Swedish term for assault rifle) is the Swedish version of the FN FNC assault rifle with certain modifications, mostly to adapt the weapon to the Swedish climate.
Question : Which is the basis of Ak 5?
FN FNC