I have two of the CDNN 30 round steel mags I would trade for an equal value of 9mm brass. I bought them when i first got my SUB 2000 and in all honesty they do not fit the grip well properly and are loose. Just as an experiment I cut and stuck some of the Velcro 'fuzzy' part on the area of the mag that fits into the grip as a shim and they ran fine. I did have to take them apart and clean them as well as adjusting and trimming the 'lips' of the mags to properly feed. Anyway if you want to experiment and come up with something as I did to make them fit the gripwell properly a trade for brass would be the right price!