COLTIMPALA
Yo homie... is that my briefcase?
I assumed this was as good of place as any to ask. I came across a couple of these some time ago. They have no markings besides an "0M" on the lower back of the magazine. The person they came from also had a ton of linked ammo and milsurp stuff dating back to gos knows when if that's any clue. They accept 308, but 30-06 is too long. Maybe HK/CETME?