Production & QC errors occur everywhere.
One factor with Ruger is undoubtedly the quantity being produced, and another is an apparent weakness in post-production QC inspection.
Even in smaller outfits, I see things that should not be getting out the door, so while Ruger's feet should definitely be held to the fire on quality, the company is far from alone there.
Monday I was working with a $1200 single-action from another company that was extremely well built overall, but for the first time in my life had to be fired with duct tape holding the front sight still.
Attachment screw was too long, bottomed out, entire sight was loose & wobbly in every direction.
Can't imagine how it was not picked up at the factory when that sight was first attached to the barrel.
With Ruger producing millions of guns, multiply that factor accordingly.
Still no excuse for some of the errors they've shipped, but helps explain it.
Denis