Y'know, this is totally in a different direction, but I have an old but nice Star Modelo B Super that I think is very mechanically accurate. This wasn't scientific, but we were at an outdoor range with a 50 yd distance, and then an earthen berm about another 10 yds behind it. Someone had put 5" styrofoam plates on the berm, and I was able to hit them pretty consistently with my Star and my High Standard .22lr (a Sport King). The Star has a long slide, very smooth slide action, and you don't get a lot of recoil out of it. I was seated and rested my arms on the bench. I'm a decent casual shooter, but by no means great, and I was hitting with greater than 50% accuracy. I have little doubt that the gun could shoot much better than I can, and a person with the right skills could push that percentage a lot higher.