In Fig. 6, the analysis with scanning electron microscopy (SEM) show the details that are proper of the striae and it allows the comparison between replicas together their link to the same gun.
This technique does not, in principle, provides any additional information but reports, at very high magnification, the real morfological profile of striae and of some interesting details such
as major groove or the micro-periodicity within the features.
This is important to outline a strict and unmistakable profile to be associated and to dispel any reasonable doubt as incompatibility.