I appreciate all the help. I still am at a loss as to the exact changes in the front band that would need to be made to fit correctly as with an official school barrel band like the one Grandpa's gun parts had for sale.

Does anyone have a real school carbine that can take good pictures and dimensions for me to replicate? Did someone here buy that one from Grandpa's gun parts? I'd like to find someone who has one for me to try to alter or someone who could alter one properly.

Otherwise, I'll just leave it alone and watch for an available band in the future. It's a nice carbine overall anyway. I'd like to know more about what the second Cartouche is also.