No problem, it is an easy one to make. I have found that the most accurate way to measure the length of the barrel on a Model 1897, or a Model 12 (or it's two clones, both short lived)-- take a Stanley tape rule and run it down the barrel from the muzzle, hook the tab on the back edge of the chamber ring, and read it at the muzzle. A friend has an early Model 1897 non-takedown with the damascus barrel, and it has 2&5/8" chambers--

"The field is the touchstone of the man"..