The mag on the left is a 10 round magazine and the one on the right is the 15 round NFML Pre-Ban magazine, as per the website here: http://www.northeastshooters.com/vbulletin/showthread.php?t=4944
Both were taken in very recently with bought guns and have only been run for a couple of times. The NFML mag has what appears to be a cosmetic only crack on the back and seems to need a new spring or something. With WWB, it jams with a FTL on the last round. With Wolf, it worked okay. The 10 round mag worked fine.
Asking $15 shipped for the 15 rounder and $16 shipped for the 10 rounder.
Edit: 10 round mag is sold.