RE: breaking in
I have a P90 that I' ve had for several years and it will shoot 2 to 3 inch 5 shot groups with hand loads or factory loads from a sand bag rest. That' s good accuracy for an inexpensive 45 ACP. It still takes some degree of skill to shoot a 45 even from a sand bag. That comes from practice. I' ve been practicing with one for over 30 years. I' ve always been happy with the P90 and most other Ruger firearms.