Some history on Hilver products:
"Hilver WAS Australian and it seems was put out of business by the anti gun State government there. However, the rights were sold to Lynx and they moved to South Africa, but things it seems didn't work out and they merged or got brought up by Blount who own B-Square and they are now sold under that banner/name. Sadly, they do not seem to be of the same quality as the originals! The old Tasco steel mounts were in fact re-badged Hilvers."
So, if you have Hilver/Tasco rings and bases, hang on to them!