I can't speak for anyone else, but I was taken by surprise at how quickly Ruger dropped models during this series. Here are some that I believe are uncommon. I had a chance to buy each but let all but one slip through my fingers for various reasons. The MKIII model name is a guess.
1) MK678III - Blue 6 7/8" tapered target.
2) MK678GIII - Blue Government Target Model. I know this one is uber rare.
3) KMK4III - Stainless 4 3/4" pencil barrel.
4) P4GCMKIII - 22/45 with a 4" slab sided barrel. Finally got one of these.
I would be curious about other's thoughts on these particular models.
1) MK678III - Blue 6 7/8" tapered target.
2) MK678GIII - Blue Government Target Model. I know this one is uber rare.
3) KMK4III - Stainless 4 3/4" pencil barrel.
4) P4GCMKIII - 22/45 with a 4" slab sided barrel. Finally got one of these.
I would be curious about other's thoughts on these particular models.