Ordered the 771's and received them a couple of days ago. Very well made and I really can't see how the mags could easily fall out. The only thing I see is the tension screws may need some loctite to retain them as when they are adjusted to where I get a smooth release the screws feel like they could back out really easy. Or maybe instead of loctite, just remove the washer at the head of the screw and replace it with a rubber o-ring to help retain it.
Thanks for the info on these.
Zack