I had (3) 645's... Couldn't get any of them to shoot accurately at 25 yds. Loved the gun, but I mostly target shoot. Then I got a 745, and sold my last 645.
Then I found a 945 one day, wasn't looking for it, didn't want one, and eventually came home. Then I bought another in case it broke. But I never did get rid of my 745, it shot too well.