Ruger Mark 1 with Mag release at the bottom of the grip works with the 9 round magazine. The Mark 2 also has the Mag release at the bottom of the grip but uses the 10 round magazine.
https://www.hammerstrutsupport.com/ This keeps the bar on back of the hammer from getting caught during re-assembly. Without it you have to point the barrel up as you re-assemble it.