I'd like to add a caution about some of the after-market M14/M1A mags: Beware that some of these are really cheap junk. One quick thing to look for is the locking piece on the back of the mag body: If the protrusuion is a seperate piece of metal welded or spot welded in place you should be OK. If it's just a stamped protrusion, don't waste your money on it. Those quit locking properly really fast.
Sorry, I should have clarified. The reason I asked, is that I have an Armalite AR10T and a second A2 upper for it as well. The mags it uses are converted M14 mags. I can get them from Armalite directly, or can buy the conversion kit and do the surgery myself. The conversion kit is available two ways: With or without the box. The "with" kit means that you basically only need the spring and floorplate from the M14 mag. The "without" kit is a bit more challenging. You need to cut the locking hole in the correct location, reduce the length of the feed lips, and cut a slot in the back of the mag for the new bolt catch. Then you can assemble everything to find out that it doesn't work and you just ruined a perfectly good mag. I don't really NEED any, but I think I want a few more, especially since we all know what's coming down the pike. I'd like to find someone to order 3 or 4 twenty rounders from Armalite for me and then ship them to me. New York says that I'm not supposed to be playing with them "cause I might hurt myself or something.
I'm selling USGI original M14/M1A on gunauction.com with a US marked canvas pouch for $45. I bought my M1A from a friend who thought two dozen mags wasn't enough. The worst mag in the bunch was a little rusted and beat up, after 25yrs it is the only mag I've ever used and it has never failed me. The older M14 mags were well made.
OK, so after writing my last comment I went to rhe Armalite home page and found out that the mags that my rifle uses are no longer listed. Uh-Oh ! The only thing I could find was Gen II. The new version may or may not fit in my rifle. I will have to call them on the phone on Monday to find out what gives.