Just about all of them are inherently accurate.
Practical accuracy is another matter. Light weight and short sight radius really presents a challenge.
I split the difference .
My 22 LR "Kit Gun" came with a 3 inch barrel and adjustable sights ... Perfect !
The 3 " barrel slips into a pocket or holster just as easily as a 2 inch .
Adjustable sights let you pick the load you like and adjust the sights to it ... that feature is worth it's weight in gold !
Mine is a Air-Lite and weighs just a few ounces ... it is usually the revolver that gets picked up and slipped in a pocket when I walk out the door . I would think long and hard on this model ... If it isn't perfect I don't know what is !
No ammo I have shot in mine has ever keyholed ...not once .
Gary
Could be as simple as the difference in triggers. The K frame triggers on mine seem to be much smoother than the one on the 63.Interested in the difference I'd been witnessing on my range between my K22 6", a M18 4" and the M63 4", I sandbagged them all one day......
Far from scientific and with only a small variety of .22 LR ammo.
Shot at 20 yards.
As pretty much expected, the K22 mostly made a ragged hole with 1-2 cylinders-full of most ammo, HV and SV.
The M18 seemed a little more ammo-finicky but would also do the same with it's favored fodder.
The M63, would certainly 'group', but in a much more casual relation to the existing holes it made. IIRC, it liked CCI SV ammo best.
Final un-scientific results: The M63, at least mine, is not a target pistol and was not intended to be.
It does great for it's intended role - a handy small frame, high quality .22 revolver.