I have a 22/45 and it is a fun gun to shoot. I also have a S&W mod41 it is the best shooting .22 pistol I ever shot bar none.
I sell these, so I know how... So, to get back to the orig. ? you can see videos showing Ruger MK III disassembly if you go to Youtube and type that into the search.
Mary Kay at PersonalSecurityZone.com
When I go to the range, I always start with my Smith 41, It is a cheap way to get into the zone before shooting .40.
It’s about the same weight as my SIG.