I am fairly sure that it was actually AJ Parker rather than Parker Hale (competitors) who made the M80
Normally for any Mauser actioned rifle but different fittings were available.
I believe they were actually designed to suit PH 7.62 target rifles (such as the 1200TX)
Post a picture of what you have.
This is an example showing the 'standard Mauser 'rounded action' mount.