I finally got to function test my magazines that I bought a while back.  They seem to work OK for the most part, except that they (both the 20 and 30 rounders) seem to let the last round fly loose, locking the bolt open with a live round sitting in front of the bolt.  The round isn't chambered or jamming.... the magazine seems to be letting it fly loose.  Also, all three magazines that I have now have wear marks on the right lip.  Do I just have junk magazines, or is there another problem?

They have no markings, so I don't know who made them.

Here's a pic before I used them:

http://www.williamchristopher.net/pix/ar15/mag_top.JPG

http://www.williamchristopher.net/pix/ar15/mag_side.JPG

are those USGI? steel or aluminum?, your problem is the feedlips they are bent or cracked, that would be my best guess

i have those same mags. i also am haveing problems with them. my feed lips are a little out of spec. one side is higher than the other. do your followers seem too tight to move freely? i ordered some orange followers and will see if that helps. i will get back to you.

BWT how do you like Netflix??

Followers seem to be tight, but move OK.  Netflix was great while I had it.... burned like 50 DVD's, and ran out of stuff to order and canceled it.