Agreed, and for me, the actually measured 5/16” thickness is the most reliable dimension that we currently have in this discussion to gauge the other distances.
Let's review..... The so called "palm print" was allegedly lifted from the bottom ( and right hand side) of the 5/8" metal barrel. The mid point of the print was about 3 inches to the rear of the forward end of the wooden stock. The print was about 3/4 inch in diameter. The forward end of the print would have been about 2 3/8 inches to the rear of the front end of the wooden stock.
The bayonet lug cannot slide back on the barrel beyond 3/4 inch from the front end of the stock. ( the lug is precision machined to fit the tapered barrel ) Since the lug cannot slide back beyond 3/4 inch ( from the front of the stock there cannot be any marks that could have been created by the bayonet lug beyond that 3/4 inch limit. And the gap between the front of the print and the lug would be 1 5/8 inches. However CE 138 shows the print circled in red ink ....and the distance from the front of the print to the rear of the two parallel lines is about 1/4 the width of the tape ( so if the tape is 2 inches wide then the distance from the front of the print to the two lines is about 1/2 inch
Bottom line:... the two lines could NOT have been made by the bayonet lug.