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It looked like the guys in the first vid (the one I watched) were just holding the mags in.not locking them in place at all, I've done that on a few shoots (by backing off the mag catch so the mag doesn't lock) it speeds up reloads but increases the chance of a stoppage.
Edit: And before saying that I wouldn't wear that in the field, I would wait a couple of years for them to engineer all the bugs out of it. I think having the mags coming out of the exact same spot every time would help muscle memory. (IMHO)
Thats a pretty cool toy. I would be scared however, as mentioned above, that a jam would happen and you wouldn't be able to get any of your magazines out! I wonder if there is some kind of feature to open the entire thing in case something goes awry.