There's a company called Port City Armory that contacted me weeks back about selling their new magazines. I asked if I could get a couple to evaluate.
It looks like they're trying to compete with Magpul. Plastic mags with plastic follower and steel spring (not stainless like Magpul). They seem to be decently made, although I wonder if the follower works as well as those on Pmag's. The baseplate comes off more easily than Pmag's, which is nice (I had to disassemble a lot of Pmags months back, and it's a pain).
Anyway, if someone here does a lot of AR shooting, and would want to give a mag a torture test, I'd be glad to send it. I'd like to get some feedback on how well the mags work.
Just let me know.