Drew:
I just posted the dimensions Dan wrote down which he said were minimum and his overall assessment that the barrels are in great condition and are perfectly safe to shoot with proper ammunition.
He used a device he has set up permanently on a workbench to do these measurments.
I was just there this afternoon and I know you two know each other so give him a call if you have questions.
Jim

The 2nd Amendment IS an unalienable right.