Um this is an interesting one as well.
Belleau Wood rifles
605585
605591
605637
606538
605639
606538
New Marine rifles around your serial
606131
SRS
605949 083025CAMP DEVENS
606093 073023165TH INF NYNG TO RARITAN ARS
606355 041447SAA (TURNED IN BY FBI)
606386 082538USMC - SAN DIEGO (SURVEY)
606434 100426USMC - PHILA NSY (SURVEYED