Ruger. I have a Ruger Standard which was the original version of the MKIII super accurate little gun.
I'm gonna stop you right there, you just said an AR-15 is a high-powered rifle. It is obvious you don't know anything about guns and I shall ignore anything you say from this point on.
I have one of the newer model 22/45s and one of the older, 1st gen 22/45s as well and I have no complaints for either. Add a few parts from Volquartsen and any of the SA Ruger pistols are so easy to shoot there is almost nothing to hitting the "x"