As far as I know, the only way to buy an AX stock on it's own, is as an
AICS (Accuracy International Chassis System) separate chassis systems. The problem is they aren't designed for AI's, they're for Remingtons and unless I'm mistaken, they're not interchangeable. So... the only way to get an AT action in an AX stock is to buy both rifles in their entirety. I'm happy to stand corrected if I'm wrong, but I don't think I am.
You just get the 20 moa rail, but a company is offering a 0 moa imminently. You can attach rails to the stock sides and underneath if you wish.
I believe the AT is just as well built, it certainly feels like it and incidentally all AI's have floating barrels.