Its the same modern Rigby Highland Stalker rifle but without open sights and longer barrel. Maybe the same barrel profile as the shorter barrel.

Is it a magnum length action or not? I will have to enquire.

IMO a slimmer barrel profile would be far preferable, and I would keep open sights on it.

The original barrel length is for standard cartridges.

A longer barrel is suitable for a magnum cartridge such as a .300 Win Mag.

Should the forend be longer? That is questionable?