NEC 300-14 requires at least 6"of free conductor to be left at outlet boxes. The question is--- Two NM-Bs come into a single gang box. Does it meet the intent of the code to take the two grounding conductors and slide on a crimp sleeve and crimp at the face of the box and then cut off one of the grounding conductors at the crimp sleeve leaving the cut off ground stopping at the face of the box?