Got the magazine I ordered today. Will be making that "magazines" at a later time. Just a few points:
No FTC when firing slowly, or dumping the mag. Bolt open on last round, cycles fine.
Mar Lube is NICE! Gives a good positive grip. Also, seems to hold up well (longer testing on this).
As mentioned by others, the magazine is light. I've held a H&K for comparison, and you can easily tell the difference.
I decided (very unscientifically) to fling it about loaded and unloaded onto dirt, grass, gravel, and concrete. Aside from a few scratches and dings, no problems. Nada.
A Lula loader WILL work without problems.
You can load 31 rounds. Will even cycle properly, but I'll just keep it at 30 myself.
The follower is grey, not green as said earlier. And of (obvious) Magpul design.
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In conclusion, CP seems to have put out a great product. Kudos!
Also, I'd like to thank them for quick service. I had an accidental second charge for shipping, and they cleared it up within the same day.