Many, probably most carbines were carried by Officers, Signal men, staff people, truck drivers etc. These carbines were not shot much either in the war or after. The ones that went to infantry personnel like on Iwo Jima were shot to pieces. These are the ones with new or non original barrels. Additionally the barrels are good for many rounds 15K, or more, that's a lot of shooting. So we have a typical carbine issued to a cook handed down to more cooks who qualify with 50 rds once a year and after 1965 they were gone. They were rebuilt and the bayonet lug and adjustable sights added sometime in their life. Now we have them. The cook got an M14then an M16 and Clinton destroyed what he could.