I can't speak why it isn't being advertised, but it has all the earmarks of a one-piece design. I don't see any indication that the handle is brazed on. The casting line from the handle to the bolt body meets perfectly on all four or my Portuguese M70s, and there is no indication of any brazing material overflow at all on any of them. Even some of the tiny casting dimples cross the the "joints" indicating the bolt and handle were cast as one piece.

Brazing material overflow, to some degree, is almost inevitable and leaves tell-tale "gold" lines at the joints between the brazed together part. That overflow won't accept bluing. Here's a view examples from some of my 700 with brazed handles.

[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

I understand that the Connecticut M70 classics reintroduced in 1992, and the M70s produced at the FN plant in SC, had brazed bolt handles. But it appears to have been dispensed with with production at Brownings Viana, Portugal plant, which, in olden days, produced Mausers.