Richard W. said:
I wonder if they even took the pins out to adjust it.
Your pictures make me wonder if they didn't merely clamp the FSB in a steel-jawed vise and twist the rifle.
That's a scary thought.
Since I had both an SLR107FR and an SA M7R corrected for canted sights, I'll describe my experience.
My SLR107FR came back to me with a new rear sight with red markings (the original had white markings). I also thought my front sight looked pretty straight to begin with. My final assessment was that they may not have done anything other than replace a defective rear sight. I had kind of come to believe the "clamp" marks like in the pics above were actually due to my own sight tool, and not anything Arsenal did. Rocketfish, are you sure Arsenal made the marks? I'm not doubting you...just asking in the name of objectivity.
My SA M7R, on the other hand, shows clear evidence that the front sight was moved: the pins are partially unfinished, and I remember the cant the front sight had but no longer has. It also has NO clamp marks like in the above pics.
As to "twisting"--I'll have to say I "kinda" doubt it. During the days when people were pulling the shark gill muzzle brakes off their SA M7's right and left, I remember a couple of threads where people had "ruined" their barrels by twisting the brakes as they removed them. Supposedly,these people had dismal accuracy after twisting off their shark-gill brakes. The brakes, front sight bases, gas blocks, etc., are all supposed to be a press fit, so twisting during removal might very well contort the barrel and destroy the accuracy as well.
During my conversations with Julia, she stated that the SLR107FR sight problems were an "easy" fix, whatever that means.
Just food for thought; I don't have all the answers either.