I am currently the proud owner of 4 of Bill Ruger's fine examples of .22 rimfire firearms. They from 38 yrs. young to 54 yrs.
The first one I bought personally was a Bearcat Mfg'd in 1967. Dainty little thing but shoot extremely well as a point shooter. Don't try to aim.
Next was a Single Six Convertable. Also in 1967. Killed a lot of snakes and put several thousand rounds through it.
After that it was a Mk I 5.5" Bull barrel with adj. sights.(Target Model) Guesstimate 250k+ rounds. Still way more accurate than I can shoot. Squirrel and rabbits don't have a chance. 1973
target was at 25 yds.
Last but not least I inherited my fathers 1958 Mk I Target with 6.75" tapered barrel when he passed in 2006. It is the pride of my small collection. He taught me to shoot pistols with it. Guesstimated rounds 500k+. Still an extremely accurate pistol.
Both revolvers are original 3 screw and Ruger will never see them. Only a careless moron needs a safety bar to prevent shooting himself.