I looked around and I haven't been able to find much about these other than the prototype pictures and the adds Socom Gear has done. They look like a great alternative to the awesome albeit pricy pmags, but who know they could always turn out to be garbage. They are OEM by madbull so I expect decent quality.
I think they do a great job of replicating a great magazine and I can only hope to get my hands on them soon. I would love to hear any impressions you guys have of these. Sorry if a thread for these exist already, I checked and couldn't find any with search terms I used.