As I recall, this feature was an additional method of insuring the cock-on-closing small ring bolt wouldn't accidental pop open.
If you cock the small ring bolt, and lift the handle, the spring pressure will pop the bolt open.
The lug system locked the bolt closed during actual firing.
I don't think this is necessary on a sporterized rifle, and it wasn't needed on the cock-on-opening 98 Mauser.
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