Thanks Magus! I have been through all of those though. Same issue I have found everywhere else, all the AR mags for 7.62X39 are stainless. I am looking polymer. Naturally I went to Magpul first and Promag with no avail. I know a guy that has several of them, but they came with his rifle when he bought it, so I know they exist. One of the biggest issues I have heard about this caliber in an AR is failing to feed. What has been found is a lot of the metal mags bending the feed lips bending when hitting things like ground, asphalt etc. People have a hard time bending the lips back into a good, straight alignment. So just trying to get away from that. I do have a pair of 30 round ones to use when I get it built though.