Raellus
you might be thinking of some of the south American countries there are a lot of Galil's in Columbia. But never seen any references to Mexico being armed with the Galil.
Mexico Makes G3 rifles and they Made under license by DIM (Departamento de la Industriá Militar) and DGFD (Dirección General de Fábricas de la Defensa).
They are soon to be replaced by the FX05 which is a g36 clone.
Brother in Arms
Coincidentally I stole the picture from an Isreali web page