His serial number isn't a direct hit, but the majority of the 8380XX numbers on the list are USMC rifles. Here's the closest:
838019 020630USMC - NICARAGUA (BAD BBL)
838019 032530USMC - NICARAGUA (SURVEYED)
838054 011031USATC - CO I 15TH INF
838055 042231USMC - SAN DIEGO