Any idea as to what it is?

[Dan Shapiro]

Found at Camp Pendleton. Looks like it's been on the ground for a long time. Can find no reference to it anywhere.



48986

48987

[Dan Shapiro]

Found it! One weird round!

https://cartridgecollectors.org/cmo/cmo05oct.htm

[Parashooter]

Very interesting. Thank you!