5/18 is when the rifle went to store as is the 5/44
5/18 is when the rifle went to store as is the 5/44
"M" on the bolt head means that it is made from "mild steel" that has been surface hardened. Very common on Lithgows.
Unmarked bolt heads are made from "malleable cast iron".
3MD = 3rd Military District = more or less; State of Victoria.