I have a 6 7/8" Competition Target 22/45 - blued that I bought NIB in 1997. Flat-sided barrel. It's twin is the 22/45 Great Eight with the extra 1.125" of steel.
Both have the target trigger and both were Davidson's specials.
Dandy pistols for headshots felling the big Aberts' squirrels from the Pondersoa pines.
Neither came with the scope mount & rings, even if Ruger's catalog stated clearly that "All Competition Target Models come with mount and Ruger scope rings."