I believe who I spoke to at AG said specifically that the ejection port and the bolt release would not line up right and would need some fitting/milling. Again, I am talking about drop in ready. They said it would ultimately work with gunsmith work.
I recently installed a Carbon All Terrain on a LA Ridgeline. Ejection port is fine. I had to do a minor notch for the bolt release. Definitely did not require me taking to a smith. Ordered with the HS Precision DBM bottom metal, and it fit fine. The CA bottom metal and box are generally a little smaller than a standard Remington.