If the gandg will take TM type buffer tubes and stocks then a JG 416 stock will fit (its the same proper E1 stock seen on the real 416)
Like so
Tho its not 100% the same as the real 416 (mainly the the button/lever for adjuting it isnt correct)
Its about the closest in airsoft.
Im not sure if the vfc is the same spec as TM type buffers but id imagine it is so it should fit.