I'm lost. Are you saying your bayonet lug looks like this:
Sorry, but one has to guess at what you mean because you won't post any pictures.
If the lifting tape is 2" wide, the linear lines are 5/16" apart, the same width as the bayonet lug. (From this pagee )
The diameter of the barrel at that point is..... .652" (21/32") Pi X .652 = 2.04 " So the circumference is 2".
So you're saying that Day used 2 inch wide tape and wrapped it completely around the barrel even though the print covered only a fraction of 2 inches. And then you place the tape that was on a cylindrical surface on a flat surface and think that you can present that BS as factual information.
Only a moron would believe that detective Day wrapped the circumference of the barrel with 2" wide tape when the print was on about 1/2 inch of the surface.