https://frontierfirearms.ca/carl-gustaf-3000-30-06-used/
There you go
Type: Posts; User: 300CALMAN
https://frontierfirearms.ca/carl-gustaf-3000-30-06-used/
There you go
If you could find a picture of the net of an original magazine it would help.
looks like a Tikka 695 mag might fit
https://www.guncity.com/tikka-magazine-695-short-action-3rnd-348709