The older Auto Ordnance 1911's were pretty rough, and quality seemed to be very spotty. Ones that I looked at were poorly finished, inside and out, and I felt that they would probably require a lot of parts replacement/fine tuning to get them up and running. I have not seen any of the newer Kahr built ones, but I would be willing to bet that Kahr is probably turning out a better product than AO was.
I believe the older AO's used parts from Europe, possibly Italy, to assemble their 1911's with. The Rock River, and I think the High Standard 1911, are built in the Phillipines; Springfields are made in Brazil. I think for a no frills 1911, you can't go wrong with any of the newer made guns.