AFAIK, this setup was a lightweight 20" barrel dropped into the same walnut stock as the standard contour 22" and 24" tubes...
Ruger doesn't offer it anymore...
was it Ruger's attempt to diversify the M77 line regardless of demand, or was it an attempt to address a customer clamor for a lightweight M77?
Their M77 "compact" rifles are still in production, with dimunitive 16.5" barrels...
Curious as to why the lightweight 20" went the way of the dodo (?)
