This is 100% false. Accuracy International has said that they are out of spec in writing.
ETA: It was actually worse than that. They said, "They're within tolerances when they're untreated [Meaning uncerakoted]", but once we cerakote them, they're outside of tolerances. So, sorta like saying, "Your car doors will shut before we paint them, but once we paint them, it's going to be a windy ride."
Further edited to add: Sniperstud, just an honest a curious question. Why would you make the statement "Your AX rails are not out of spec, they're manufactured to a different spec than you're used to using" in the first place. Beyond it just being false, 1) How do you know what I'm used to using? And 2) how do you know "so much" about AI's manufacturing spec?
Would you rather the rails be manufactured undersized, so that they would be within specs after Cerakote? Then when the mounts wear through the finish, and they will, Cerakote is not indestructible, you would be bitching about an out of spec rail anyway. Either way, quality mounts will adjust for slightly out of spec rails.
The statement I made was a deduction, arrived at by looking at the substantiated facts you presented, and ignoring your conjecture. I will accept the content of the email as fact. The only content I see, that originated from AI, references the testing done to the barrel. The only mention of the out of spec rail was in your message to them. The comment you quoted about the rail tolerances and Cerakote did not appear in that email, unless it is part of the redacted text, therefor it is unsubstantiated.
I remembered an earlier thread about rail tolerances and a quick search produced the quote from Dave Tooley that I included in my post. I accept his word as expert testimony, so it is he, not I, that knows "so much" about AI's manufacturing specs. Finally, your email indicated that your barrel was sent to AINA, indicating you are located in the USA. The vast majority of quality rails marketed or manufactured in the U.S. are made to the 1913 specs. I deduced, then, that you would be most familiar with the 1913, or "picatinny" spec rail.
Is there room in my statement for error, yes there is, because it is an hypothesis based on your incomplete facts. If you had spent half as much time shooting that rifle as you have complaining about it, you might have found a load that worked.