I think Werewolf is questioning any differences in the SR22s (pistol) that are actually marked "pistol" on the slide versus the ones that are not marked "pistol". Any improvements in design or function in the later iterations not so marked?
Perhaps I'm way off, but it seems logical. I don't own either so I can't comment, but My MKII target works great despite the barrel billboard.
I was comparing pistol to pistol.The slide on the newer version states"sr22".On the first version it's "sr22 pistol".Ruger did not make it easy with their similar designation.