The good Sarge would have flipped nuts. For sure.
The second thought of the rifle, what I feel is more likely, is could have this been purchased by a soldier in Korea during the Korea Conflict?
I know there where stores of these rifles around due to the boxer and Philippians Rebellions, right at the turn of the 20Th century. So knowing that Grand Pa served in Korea, driving ammo to the front line. I don't Know his brigade, regiment, or company. There is a 598 stamped in the butt plate, But when I Google 598 it leads me to a post WWII transport group. I don't know if they were deployed in Korea or not though. I need to get my Mom, Aunt, Or Uncel to request the info from the US Archives. Being a grand son I don't qualify as direct enough bloodline, per their guide lines.
Regardless it is a fun and learning chase threw the family tree.