Join Date: Sep 2008
Location: Bavaria, Germany - the center of 15th and 16th century gunmaking
The measurements you requested are as follows:
A = 4.8 mm, B = 5.2 mm, C = 4.2 mm and D = 5.4 mm.
I attach a characteristic late 15th century form of a stock that would ideally complete this barrel. As the barrel was originally painted red (and still is underneath the black layer), a dark green paint on the stock would convey a perfect impression of late Gothic color taste.