Thanks for the information. I was at a gunshow in GA today and found a rather good deal on USGI mags. 17 bucks for new Center Industry pre-bans. Some of the mag bodies actually had dates on them. 91/92. Still in the center bag with the black followers. I need to get some new followers, but I think I came out on top. I got 8 at that price.
As to the reciever grinding, I did have a qualified gunsmith do the magwell to match Armalite, and the feed ramps were something I was going to do anyhow. I will play around with the orlites and see what I can do to improve their function. They might turn into decent range mags.