Nice Score! Beautiful example of what is likely the best "bang for the buck", competition worthy target pistol made. You've be very pleased with how it shoots. These were all tackdrivers (including my own.) In fact, when the US governnment ordered them as trainers, they imposed an accuracy specification. As I recall, the government models had a tighter, heat treated chamber and came with a test target proving they could meet stringent accuracy standards set by the government. ( 1.5" at 25 You won't have to Google far to find ALLOT of info on these guns.
Here is a quick sample:
"In 1986 came the Mark II Government Target Model, which can best be described as the "competition-grade" version of the Ruger 22 autoloader line. In essence, this new gun is a 6 7/8-inch Bull Barrel version of the Mark II Target Model with higher profile adjustable sights. It was created to meet U.S. Military specifications for match-grade pistols and was chosen as the standard target and training handgun of the US Armed Forces, replacing earlier models from Ruger and other manufacturers. "
p.s I still keep , 7 Ruger MK II/III pistols. in my safe despite owning target rimfires that cost 3x as much. That's how much I have grown to like them.